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  • 北京元坤伟业科技有限公司

         该会员已使用本站17年以上

  • ADS7846E/2K5
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  • ADS7846E/2K5图
  • 深圳市恒达亿科技有限公司

     该会员已使用本站12年以上
  • ADS7846E/2K5 现货库存
  • 数量5000 
  • 厂家TI 
  • 封装SSOP16 
  • 批号23+ 
  • 全新原装,欢迎查询
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    QQ:1245773710QQ:1245773710 复制
  • 0755-82772189 QQ:867789136QQ:1245773710
  • ADS7846E/2K5图
  • 深圳市能元时代电子有限公司

     该会员已使用本站10年以上
  • ADS7846E/2K5 现货库存
  • 数量92000 
  • 厂家TI/德州仪器 
  • 封装SSOP16 
  • 批号24+ 
  • 原装现货假一罚十!可含税长期供货
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    QQ:2885658492QQ:2885658492 复制
  • 0755-84502810 QQ:2885637848QQ:2885658492
  • ADS7846E/2K5图
  • 深圳市和诚半导体有限公司

     该会员已使用本站11年以上
  • ADS7846E/2K5 现货库存
  • 数量9000 
  • 厂家TI 
  • 封装SSOP16 
  • 批号23+ 
  • 原装现货,价格优势
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    QQ:1977615742QQ:1977615742 复制
  • 18929336553 QQ:2276916927QQ:1977615742
  • ADS7846E/2K5图
  • 深圳市拓亿芯电子有限公司

     该会员已使用本站12年以上
  • ADS7846E/2K5 现货库存
  • 数量22000 
  • 厂家TI/德州仪器 
  • 封装SSOP16 
  • 批号23+ 
  • 只做原装现货假一罚十
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    QQ:2924695115QQ:2924695115 复制
  • 0755-82702619 QQ:2103443489QQ:2924695115
  • ADS7846E/2K5图
  • 深圳市富科达科技有限公司

     该会员已使用本站13年以上
  • ADS7846E/2K5 现货库存
  • 数量21688 
  • 厂家TI 
  • 封装SSOP16 
  • 批号22+ 
  • 全新进口原装
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    QQ:1220223788QQ:1220223788 复制
  • 0755-28767101 QQ:1327510916QQ:1220223788
  • ADS7846E/2K5图
  • 深圳市宏世佳电子科技有限公司

     该会员已使用本站13年以上
  • ADS7846E/2K5 现货库存
  • 数量3550 
  • 厂家TI 
  • 封装SSOP-16 
  • 批号2023+ 
  • 全新原厂原装产品、公司现货销售
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    QQ:2881894392QQ:2881894392 复制
  • 0755- QQ:2881894393QQ:2881894392
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  • 深圳市芯脉实业有限公司

     该会员已使用本站11年以上
  • ADS7846E/2K5 现货库存
  • 数量26980 
  • 厂家ADI 
  • 封装BGA 
  • 批号21+ 
  • 新到现货、一手货源、当天发货、bom配单
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  • 0755-84507451 QQ:1435424310
  • ADS7846E/2K5图
  • 深圳市科庆电子有限公司

     该会员已使用本站16年以上
  • ADS7846E/2K5 现货库存
  • 数量7000 
  • 厂家TI 
  • 封装SSOP 
  • 批号23+ 
  • 现货只售原厂原装可含13%税
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  • 0755 QQ:2850188252QQ:2850188256
  • ADS7846E/2K5图
  • 深圳市晶美隆科技有限公司

     该会员已使用本站15年以上
  • ADS7846E/2K5 优势库存
  • 数量8351 
  • 厂家TI 
  • 封装SSOP16 
  • 批号24+ 
  • 绝对全新原装进口现货热卖,价格优势
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  • 0755-82865294 QQ:198857245
  • ADS7846E/2K5图
  • 深圳市芯福林电子有限公司

     该会员已使用本站15年以上
  • ADS7846E/2K5
  • 数量65000 
  • 厂家TI 
  • 封装SSOP16 
  • 批号23+ 
  • 真实库存全新原装正品!代理此型号
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  • 0755-23605827 QQ:2881495753
  • ADS7846E/2K5图
  • 深圳市芯福林电子有限公司

     该会员已使用本站15年以上
  • ADS7846E/2K5
  • 数量98500 
  • 厂家
  • 封装
  • 批号23+ 
  • 真实库存全新原装正品!代理此型号
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  • 0755-88917743 QQ:2881495751
  • ADS7846E/2K5图
  • 深圳市龙腾新业科技有限公司

     该会员已使用本站17年以上
  • ADS7846E/2K5
  • 数量13793 
  • 厂家TI/德州仪器 
  • 封装SSOP16 
  • 批号24+ 
  • 原装原厂 现货现卖
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    QQ:370820820QQ:370820820 复制
  • 0755-84509636 QQ:562765057QQ:370820820
  • ADS7846E/2K5图
  • 深圳市恒益昌科技有限公司

     该会员已使用本站6年以上
  • ADS7846E/2K5
  • 数量3200 
  • 厂家TI 
  • 封装QFP 
  • 批号23+ 
  • 全新原装正品现货
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  • 0755-82723761 QQ:3336148967QQ:974337758
  • ADS7846E/2K5图
  • 深圳市恒达亿科技有限公司

     该会员已使用本站16年以上
  • ADS7846E/2K5
  • 数量5680 
  • 厂家BB 
  • 封装SSOP-16 
  • 批号23+ 
  • 原装正品特价销售
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    QQ:1245773710QQ:1245773710 复制
  • 0755-82723761 QQ:867789136QQ:1245773710
  • ADS7846E/2K5图
  • 深圳市羿芯诚电子有限公司

     该会员已使用本站7年以上
  • ADS7846E/2K5
  • 数量883 
  • 厂家TI/德州仪器 
  • 封装SSOP16 
  • 批号21+ 
  • 羿芯诚只做原装 原厂渠道 价格优势
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  • 0755-22968581 QQ:2881498351
  • ADS7846E/2K5图
  • 深圳市美思瑞电子科技有限公司

     该会员已使用本站12年以上
  • ADS7846E/2K5
  • 数量12245 
  • 厂家TI/德州仪器 
  • 封装SSOP16 
  • 批号22+ 
  • 现货,原厂原装假一罚十!
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    QQ:2885657384QQ:2885657384 复制
  • 0755-83952260 QQ:2885659458QQ:2885657384
  • ADS7846E/2K5图
  • 深圳市能元时代电子有限公司

     该会员已使用本站10年以上
  • ADS7846E/2K5
  • 数量92000 
  • 厂家TI/德州仪器 
  • 封装SSOP16 
  • 批号24+ 
  • 原装现货假一罚十!可含税长期供货
  • QQ:2885637848QQ:2885637848 复制
    QQ:2885658492QQ:2885658492 复制
  • 0755-84502810 QQ:2885637848QQ:2885658492
  • ADS7846E/2K5图
  • 深圳市得捷芯城科技有限公司

     该会员已使用本站11年以上
  • ADS7846E/2K5
  • 数量30 
  • 厂家TI/德州仪器 
  • 封装NA/ 
  • 批号23+ 
  • 优势代理渠道,原装正品,可全系列订货开增值税票
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    QQ:3007947087QQ:3007947087 复制
  • 0755-82546830 QQ:3007977934QQ:3007947087
  • ADS7846E/2K5图
  • 北京耐芯威科技有限公司

     该会员已使用本站13年以上
  • ADS7846E/2K5
  • 数量5000 
  • 厂家Texas Instruments 
  • 封装16-SSOP 
  • 批号21+ 
  • 全新原装、现货库存,欢迎询价
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    QQ:1344056792QQ:1344056792 复制
  • 86-010-010-62104931 QQ:2880824479QQ:1344056792
  • ADS7846E/2K5图
  • 集好芯城

     该会员已使用本站13年以上
  • ADS7846E/2K5
  • 数量13793 
  • 厂家TI/德州仪器 
  • 封装SSOP16 
  • 批号最新批次 
  • 原装原厂 现货现卖
  • QQ:3008092965QQ:3008092965 复制
    QQ:3008092965QQ:3008092965 复制
  • 0755-83239307 QQ:3008092965QQ:3008092965
  • ADS7846E/2K5图
  • 深圳市晶美隆科技有限公司

     该会员已使用本站14年以上
  • ADS7846E/2K5
  • 数量15862 
  • 厂家TI 
  • 封装SSOP 
  • 批号23+ 
  • 全新原装正品现货热卖
  • QQ:2885348317QQ:2885348317 复制
    QQ:2885348339QQ:2885348339 复制
  • 0755-83209630 QQ:2885348317QQ:2885348339
  • ADS7846E/2K5图
  • 深圳市晶美隆科技有限公司

     该会员已使用本站14年以上
  • ADS7846E/2K5
  • 数量15862 
  • 厂家TI 
  • 封装SSOP 
  • 批号23+ 
  • 全新原装正品现货热卖
  • QQ:2885348339QQ:2885348339 复制
    QQ:2885348317QQ:2885348317 复制
  • 0755-82519391 QQ:2885348339QQ:2885348317
  • ADS7846E/2K5图
  • 深圳市华科泰电子商行

     该会员已使用本站13年以上
  • ADS7846E/2K5
  • 数量5000 
  • 厂家TI 
  • 封装SSOP16 
  • 批号2009+ 
  • 绝对原装现货特价
  • QQ:405945546QQ:405945546 复制
    QQ:1439873477QQ:1439873477 复制
  • 0755-82567800 QQ:405945546QQ:1439873477
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  • 绿盛电子(香港)有限公司

     该会员已使用本站12年以上
  • ADS7846E/2K5
  • 数量2015 
  • 厂家TI 
  • 封装SOP/DIP 
  • 批号19889 
  • ★一级代理原装现货,特价热卖!
  • QQ:2752732883QQ:2752732883 复制
    QQ:240616963QQ:240616963 复制
  • 0755-25165869 QQ:2752732883QQ:240616963
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  • 深圳市拓亿芯电子有限公司

     该会员已使用本站12年以上
  • ADS7846E/2K5
  • 数量9800 
  • 厂家TI/德州仪器 
  • 封装SSOP16 
  • 批号23+ 
  • 进口原装原盘原标签假一赔十
  • QQ:2103443489QQ:2103443489 复制
    QQ:2924695115QQ:2924695115 复制
  • 0755-82702619 QQ:2103443489QQ:2924695115
  • ADS7846E/2K5图
  • 深圳市得捷芯城科技有限公司

     该会员已使用本站11年以上
  • ADS7846E/2K5
  • 数量9548 
  • 厂家TI(德州仪器) 
  • 封装SSOP16 
  • 批号23+ 
  • 原厂可订货,技术支持,直接渠道。可签保供合同
  • QQ:3007947087QQ:3007947087 复制
    QQ:3007947087QQ:3007947087 复制
  • 0755-83061789 QQ:3007947087QQ:3007947087
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  • 深圳市华斯顿电子科技有限公司

     该会员已使用本站16年以上
  • ADS7846E/2K5
  • 数量64930 
  • 厂家TI 
  • 封装SSOP16 
  • 批号2023+ 
  • 绝对原装全新正品现货/优势渠道商、原盘原包原盒
  • QQ:364510898QQ:364510898 复制
    QQ:515102657QQ:515102657 复制
  • 0755-83777708“进口原装正品专供” QQ:364510898QQ:515102657
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  • 深圳市华斯顿电子科技有限公司

     该会员已使用本站16年以上
  • ADS7846E/2K5
  • 数量12500 
  • 厂家TI/德州仪器 
  • 封装SSOP-16 
  • 批号2023+ 
  • 绝对原装正品全新深圳进口现货,优质渠道供应商!
  • QQ:1002316308QQ:1002316308 复制
    QQ:515102657QQ:515102657 复制
  • 美驻深办0755-83777708“进口原装正品专供” QQ:1002316308QQ:515102657
  • ADS7846E/2K5图
  • 深圳市西源信息科技有限公司

     该会员已使用本站9年以上
  • ADS7846E/2K5
  • 数量8800 
  • 厂家TI 
  • 封装SSOP16 
  • 批号最新批号 
  • 原装现货零成本有接受价格就出
  • QQ:3533288158QQ:3533288158 复制
    QQ:408391813QQ:408391813 复制
  • 0755-84876394 QQ:3533288158QQ:408391813
  • ADS7846E/2K5图
  • 深圳市集创讯科技有限公司

     该会员已使用本站5年以上
  • ADS7846E/2K5
  • 数量9500 
  • 厂家TI/德州仪器 
  • 封装SSOP-16 
  • 批号24+ 
  • 原装进口正品现货,假一罚十价格优势
  • QQ:2885393494QQ:2885393494 复制
    QQ:2885393495QQ:2885393495 复制
  • 0755-83244680 QQ:2885393494QQ:2885393495
  • ADS7846E/2K5图
  • 北京齐天芯科技有限公司

     该会员已使用本站15年以上
  • ADS7846E/2K5
  • 数量5000 
  • 厂家Texas Instruments 
  • 封装16-SSOP 
  • 批号2024+ 
  • 全新原装、现货库存,欢迎询价
  • QQ:2880824479QQ:2880824479 复制
    QQ:1344056792QQ:1344056792 复制
  • 010-62104931 QQ:2880824479QQ:1344056792
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  • 北京元坤伟业科技有限公司

     该会员已使用本站17年以上
  • ADS7846E/2K5
  • 数量5000 
  • 厂家Texas Instruments 
  • 封装贴/插片 
  • 批号2024+ 
  • 百分百原装正品,现货库存
  • QQ:857273081QQ:857273081 复制
    QQ:1594462451QQ:1594462451 复制
  • 010-62104791 QQ:857273081QQ:1594462451
  • ADS7846E/2K5图
  • 北京齐天芯科技有限公司

     该会员已使用本站15年以上
  • ADS7846E/2K5
  • 数量5000 
  • 厂家Texas Instruments 
  • 封装16-SSOP 
  • 批号2024+ 
  • 全新原装、现货库存,欢迎询价
  • QQ:2880824479QQ:2880824479 复制
    QQ:1344056792QQ:1344056792 复制
  • 010-62104931 QQ:2880824479QQ:1344056792
  • ADS7846E/2K5图
  • 北京元坤伟业科技有限公司

     该会员已使用本站17年以上
  • ADS7846E/2K5
  • 数量5000 
  • 厂家Texas Instruments 
  • 封装贴/插片 
  • 批号2024+ 
  • 百分百原装正品,现货库存
  • QQ:857273081QQ:857273081 复制
    QQ:1594462451QQ:1594462451 复制
  • 010-62104931 QQ:857273081QQ:1594462451
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  • 深圳市欧立现代科技有限公司

     该会员已使用本站12年以上
  • ADS7846E/2K5
  • 数量300 
  • 厂家BB 
  • 封装SMD 
  • 批号24+ 
  • ★★专业IC现货,诚信经营,市场最优价★★
  • QQ:1950791264QQ:1950791264 复制
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  • 0755-83222787 QQ:1950791264QQ:2216987084
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  • HECC GROUP CO.,LIMITED

     该会员已使用本站17年以上
  • ADS7846E/2K5
  • 数量880 
  • 厂家TI 
  • 封装SOP 
  • 批号2021+ 
  • 原装假一赔十!可提供正规渠道证明!
  • QQ:3003818780QQ:3003818780 复制
    QQ:3003819484QQ:3003819484 复制
  • 755-83950019 QQ:3003818780QQ:3003819484
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  • 北京耐芯威科技有限公司

     该会员已使用本站12年以上
  • ADS7846E/2K5
  • 数量5000 
  • 厂家Texas Instruments 
  • 封装16-SSOP 
  • 批号21+ 
  • 全新原装、现货库存,欢迎询价
  • QQ:2880824479QQ:2880824479 复制
    QQ:1344056792QQ:1344056792 复制
  • 96-010-62104931 QQ:2880824479QQ:1344056792
  • ADS7846E/2K5图
  • 深圳市惊羽科技有限公司

     该会员已使用本站11年以上
  • ADS7846E/2K5
  • 数量6328 
  • 厂家TI-德州仪器 
  • 封装TSSOP-16 
  • 批号▉▉:2年内 
  • ▉▉¥29.7元一有问必回一有长期订货一备货HK仓库
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  • 131-4700-5145---Q-微-恭-候---有-问-秒-回 QQ:43871025
  • ADS7846E/2K5图
  • 深圳市华斯顿电子科技有限公司

     该会员已使用本站16年以上
  • ADS7846E/2K5
  • 数量13500 
  • 厂家TEXAS INSTRUMENTS 
  • 封装2500 
  • 批号2023+ 
  • 绝对原装正品现货/优势渠道商、原盘原包原盒
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产品型号ADS7846E/2K5的概述

ADS7846E/2K5芯片概述 ADS7846E/2K5是一款高精度的多通道模拟到数字转换器(ADC),广泛应用于触摸屏、人机交互系统及其他需要高性能数据采集的应用场合。其主要特性包括高分辨率、快速采样率以及低功耗等,使其成为各种电子产品中不可或缺的组件。 芯片的详细参数 ADS7846E/2K5芯片具有以下主要技术参数: 1. 分辨率:12位分辨率,能够提供优异的数据精度,清晰展现输入信号的细微变化。 2. 采样率:最高可达125 kHz,使其能够迅速捕捉输入信号的变化,这对于实时应用尤为重要。 3. 输入电压范围:支持在0V到VREF的输入范围内工作,VREF通常为3.3V或5V,极大地满足不同应用需求。 4. 通道数:集成了多个输入通道,具有多路复用功能,能够连接多个传感器或传输信号源,增强系统的灵活性。 5. 功耗:在正常工作模式下功耗极低,适用于便携式和移动设备,能够...

产品型号ADS7846E/2K5的Datasheet PDF文件预览

ADS7846  
A
D
S
7
8
46  
A
®
D
S
7
8
4
6
A
D
S
7
8
4
6
SBAS125H SEPTEMBER 1999 REVISED JANUARY 2005  
TOUCH SCREEN CONTROLLER  
DESCRIPTION  
FEATURES  
SAME PINOUT AS ADS7843  
The ADS7846 is a next-generation version to the industry  
standard ADS7843 4-wire touch screen controller. The  
ADS7846 is 100% pin-compatible with the existing ADS7843,  
and drops into the same socket. This allows for easy upgrade  
of current applications to the new version. Only software  
changes are required to take advantage of the added fea-  
tures of direct battery measurement, temperature measure-  
ment, and touch-pressure measurement. The ADS7846 also  
has an on-chip 2.5V reference that can be used for the  
auxiliary input, battery monitor, and temperature measure-  
ment modes. The reference can also be powered down when  
not used to conserve power. The internal reference operates  
down to 2.7V supply voltage while monitoring the battery  
voltage from 0V to 6V.  
2.2V TO 5.25V OPERATION  
INTERNAL 2.5V REFERENCE  
DIRECT BATTERY MEASUREMENT (0V to 6V)  
ON-CHIP TEMPERATURE MEASUREMENT  
TOUCH-PRESSURE MEASUREMENT  
QSPITM/SPITM 3-WIRE INTERFACE  
AUTO POWER-DOWN  
TSSOP-16, SSOP-16, QFN-16,  
AND VFBGA-48 PACKAGES  
APPLICATIONS  
PERSONAL DIGITAL ASSISTANTS  
PORTABLE INSTRUMENTS  
POINT-OF-SALE TERMINALS  
PAGERS  
The low-power consumption of < 0.75mW (typ at 2.7V,  
reference off), high speed (up to 125kHz clock rate), and on-  
chip drivers make the ADS7846 an ideal choice for battery-  
operated systems such as personal digital assistants (PDAs)  
with resistive touch screens, pagers, cellular phones, and  
other portable equipment. The ADS7846 is available in the  
small TSSOP-16, SSOP-16, QFN-16, and VFBGA-48 pack-  
ages and is specified over the –40°C to +85°C temperature  
range.  
TOUCH SCREEN MONITORS  
CELLULAR PHONES  
US Patent No. 6246394  
QSPI and SPI are registered trademarks of Motorola.  
PENIRQ  
+VCC  
X+  
Temperature  
SAR  
X–  
Sensor  
Y+  
ADS7846  
DOUT  
Y–  
BUSY  
Comparator  
CS  
6-Channel  
MUX  
Serial  
Data  
Out  
CDAC  
DCLK  
DIN  
Battery  
Monitor  
V
BAT  
AUX  
Internal 2.5V  
Reference  
VREF  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
All trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of Texas Instruments  
standard warranty. Production processing does not necessarily include  
testing of all parameters.  
Copyright © 1999-2005, Texas Instruments Incorporated  
www.ti.com  
ABSOLUTE MAXIMUM RATINGS(1)  
ELECTROSTATIC  
DISCHARGE SENSITIVITY  
This integrated circuit can be damaged by ESD. Texas Instru-  
ments recommends that all integrated circuits be handled with  
appropriate precautions. Failure to observe proper handling  
and installation procedures can cause damage.  
+VCC to GND ........................................................................ 0.3V to +6V  
Analog Inputs to GND ............................................ 0.3V to +VCC + 0.3V  
Digital Inputs to GND ............................................. 0.3V to +VCC + 0.3V  
Power Dissipation .......................................................................... 250mW  
Maximum Junction Temperature ................................................... +150°C  
Operating Temperature Range ........................................40°C to +85°C  
Storage Temperature Range .........................................65°C to +150°C  
Lead Temperature (soldering, 10s) ............................................... +300°C  
ESD damage can range from subtle performance degradation  
to complete device failure. Precision integrated circuits may be  
more susceptible to damage because very small parametric  
changes could cause the device not to meet its published  
specifications.  
NOTE: (1) Stresses above these ratings can cause permanent damage.  
Exposure to absolute maximum conditions for extended periods may degrade  
device reliability.  
PACKAGE/ORDERING INFORMATION(1)  
MAXIMUM  
INTEGRAL  
SPECIFIED  
LINEARITY  
ERROR (LSB)  
PACKAGE  
DESIGNATOR  
TEMPERATURE  
RANGE  
PACKAGE  
MARKING  
ORDERING  
NUMBER  
PRODUCT  
PACKAGE-LEAD  
ADS7846E  
±2  
SSOP-16  
DBQ  
40°C to +85°C  
ADS7846E  
ADS7846E  
"
"
"
"
"
"
ADS7846E/2K5  
ADS7846N  
±2  
"
"
TSSOP-16  
PW  
"
"
40°C to +85°C  
ADS7846N  
ADS7846N  
ADS7846N/2K5  
ADS7846N/2K5G4  
"
"
"
"
"
"
"
"
ADS7846I  
±2  
VFBGA-48  
GQC  
40°C to +85°C  
ADS7846  
ADS7846IGQCR  
ADS7846I  
±2  
"
QFN-16  
RGV  
"
40°C to +85°C  
ADS7846  
ADS7846IRGVT  
ADS7846IRGVR  
"
"
"
"
NOTE: (1) For the most current package and ordering information, see the Package Option Addendum located at the end of this data sheet, or see the TI web site  
at www.ti.com.  
ADS7846  
2
SBAS125H  
www.ti.com  
ELECTRICAL CHARACTERISTICS  
At TA = 40°C to +85°C, +VCC = +2.7V, VREF = 2.5V internal voltage, fSAMPLE = 125kHz, fCLK = 16 fSAMPLE = 2MHz, 12-bit mode, and digital inputs = GND or +VCC  
,
unless otherwise noted.  
ADS7846E  
PARAMETER  
CONDITIONS  
MIN  
TYP  
MAX  
UNITS  
ANALOG INPUT  
Full-Scale Input Span  
Absolute Input Range  
Positive Input-Negative Input  
Positive Input  
0
0.2  
0.2  
VREF  
+VCC + 0.2  
+0.2  
V
V
V
Negative Input  
Capacitance  
Leakage Current  
25  
0.1  
pF  
µA  
SYSTEM PERFORMANCE  
Resolution  
No Missing Codes  
Integral Linearity Error  
Offset Error  
12  
Bits  
Bits  
11  
±2  
±6  
±4  
LSB(1)  
LSB  
Gain Error  
External VREF  
LSB  
Noise  
Including Internal VREF  
70  
70  
µVrms  
dB  
Power-Supply Rejection  
SAMPLING DYNAMICS  
Conversion Time  
12  
CLK Cycles  
Acquisition Time  
3
CLK Cycles  
Throughput Rate  
Multiplexer Settling Time  
Aperture Delay  
125  
kHz  
ns  
ns  
500  
30  
Aperture Jitter  
Channel-to-Channel Isolation  
100  
100  
ps  
dB  
VIN = 2.5Vp-p at 50kHz  
Duration 100ms  
SWITCH DRIVERS  
On-Resistance  
Y+, X+  
Y, X–  
Drive Current(2)  
5
6
mA  
50  
REFERENCE OUTPUT  
Internal Reference Voltage  
Internal Reference Drift  
Quiescent Current  
2.45  
1.0  
2.50  
15  
500  
2.55  
V
ppm/°C  
µA  
REFERENCE INPUT  
Range  
+VCC  
V
Input Impedance  
SER/DFR = 0, PD1 = 0,  
Internal Reference Off  
Internal Reference On  
1
GΩ  
250  
BATTERY MONITOR  
Input Voltage Range  
Input Impedance  
Sampling Battery  
Battery Monitor Off  
Accuracy  
0.5  
6.0  
V
10  
1
kΩ  
GΩ  
%
External VREF = 2.5V  
Internal Reference  
2  
3  
+2  
+3  
%
TEMPERATURE MEASUREMENT  
Temperature Range  
Resolution  
40  
+85  
°C  
°C  
°C  
°C  
°C  
Differential Method(3)  
TEMP0(4)  
Differential Method(3)  
TEMP0(4)  
1.6  
0.3  
±2  
Accuracy  
±3  
DIGITAL INPUT/OUTPUT  
Logic Family  
CMOS  
Logic Levels, Except PENIRQ  
VIH  
VIL  
VOH  
VOL  
PENIRQ  
VOL  
| IIH | +5µA  
| IIL | +5µA  
IOH = 250µA  
IOL = 250µA  
+VCC 0.7  
0.3  
+VCC 0.8  
+VCC + 0.3  
+0.8  
V
V
V
0.4  
0.8  
TA = 0°C to +85°C, 50kPull-Up  
V
Data Format  
Straight Binary  
POWER-SUPPLY REQUIREMENTS  
(5)  
+VCC  
Specified Performance  
Operating Range  
Internal Reference Off  
Internal Reference On  
fSAMPLE = 12.5kHz  
Power-Down Mode with  
CS = DCLK = DIN = +VCC  
+VCC = +2.7V  
2.7  
2.2  
3.6  
5.25  
650  
V
V
µA  
µA  
µA  
µA  
Quiescent Current  
280  
780  
220  
3
Power Dissipation  
1.8  
mW  
TEMPERATURE RANGE  
Specified Performance  
40  
+85  
°C  
NOTES: (1) LSB means least significant bit. With VREF equal to +2.5V, one LSB is 610µV. (2) Ensured by design, but not tested. Exceeding 50mA source current  
may result in device degradation. (3) Difference between TEMP0 and TEMP1 measurement. No calibration necessary. (4) Temperature drift is 2.1mV/°C.  
(5) ADS7846 operates down to 2.2V.  
ADS7846  
SBAS125H  
3
www.ti.com  
PIN CONFIGURATION  
Top View  
VFBGA  
Top View  
SSOP, TSSOP  
DCLK  
CS  
DIN BUSY DOUT  
+VCC  
X+  
1
2
3
4
5
6
7
8
16 DCLK  
15 CS  
1
2
3
4
5
6
7
A
B
C
D
E
F
NC  
NC  
Y+  
14 DIN  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
NC  
+VCC  
+VCC  
X+  
PENIRQ  
+VCC  
X–  
13 BUSY  
12 DOUT  
ADS7846  
Y–  
NC  
NC  
NC  
GND  
VBAT  
AUX  
11 PENIRQ  
10 +VCC  
VREF  
Y+  
AUX  
9
VREF  
NC  
NC  
NC  
NC  
G
X–  
Y–  
GND GND VBAT  
Top View  
QFN  
BUSY  
DIN  
1
2
3
4
12 AUX  
11 VBAT  
10 GND  
ADS7846  
CS  
DCLK  
9
Y–  
PIN DESCRIPTION  
SSOP AND  
TSSOP PIN #  
VFBGA PIN #  
QFN PIN #  
NAME  
DESCRIPTION  
1
2
3
4
5
6
7
8
9
B1 and C1  
5
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
+VCC  
X+  
Y+  
X–  
Y–  
GND  
VBAT  
AUX  
VREF  
+VCC  
PENIRQ  
DOUT  
Power Supply  
X+ Position Input  
Y+ Position Input  
XPosition Input  
YPosition Input  
Ground  
Battery Monitor Input  
Auxiliary Input to ADC  
Voltage Reference Input/Output  
Digital I/O Power Supply  
D1  
E1  
G2  
G3  
G4 and G5  
G6  
E7  
D7  
C7  
B7  
A6  
10  
11  
12  
Pen Interrupt. Open anode output (requires 10kto 100kpull-up resistor externally).  
Serial Data Output. Data is shifted on the falling edge of DCLK. This output is high  
impedance when CS is high.  
13  
14  
15  
A5  
A4  
A3  
1
2
3
BUSY  
DIN  
CS  
Busy Output. This output is high impedance when CS is high.  
Serial Data Input. If CS is low, data is latched on rising edge of DCLK.  
Chip Select Input. Controls conversion timing and enables the serial input/output register.  
CS high = power-down mode (ADC only).  
16  
A2  
4
DCLK  
External Clock Input. This clock runs the SAR conversion process and synchronizes serial data  
I/O.  
ADS7846  
4
SBAS125H  
www.ti.com  
TYPICAL CHARACTERISTICS  
At TA = +25°C, +VCC = +2.7V, VREF = External +2.5V, fSAMPLE = 125kHz, and fCLK = 16 fSAMPLE = 2MHz, unless otherwise noted.  
POWER-DOWN SUPPLY CURRENT  
vs TEMPERATURE  
SUPPLY CURRENT vs TEMPERATURE  
400  
350  
300  
250  
200  
150  
100  
140  
120  
100  
80  
60  
40  
20  
40  
20  
0
20  
40  
60  
80  
100  
40  
20  
0
20  
40  
60  
80  
100  
Temperature (°C)  
Temperature (°C)  
SUPPLY CURRENT vs +VCC  
MAXIMUM SAMPLE RATE vs +VCC  
1M  
100k  
10k  
1k  
390  
370  
350  
330  
310  
290  
270  
250  
fSAMPLE = 12.5kHz  
2.0  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
2.0  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
+VCC (V)  
+VCC (V)  
CHANGE IN OFFSET vs TEMPERATURE  
CHANGE IN GAIN vs TEMPERATURE  
0.6  
0.4  
0.15  
0.10  
0.05  
0
0.2  
0
0.2  
0.4  
0.6  
0.05  
0.10  
0.15  
40  
20  
0
20  
40  
60  
80  
100  
40  
20  
0
20  
40  
60  
80  
100  
Temperature (°C)  
Temperature (°C)  
ADS7846  
SBAS125H  
5
www.ti.com  
TYPICAL CHARACTERISTICS (Cont.)  
At TA = +25°C, +VCC = +2.7V, VREF = External +2.5V, fSAMPLE = 125kHz, and fCLK = 16 fSAMPLE = 2MHz, unless otherwise noted.  
REFERENCE CURRENT vs TEMPERATURE  
REFERENCE CURRENT vs SAMPLE RATE  
18  
16  
14  
12  
10  
8
14  
12  
10  
8
6
4
2
6
0
40  
20  
0
20  
40  
60  
80  
100  
0
25  
50  
75  
100  
125  
Temperature (°C)  
Sample Rate (kHz)  
SWITCH-ON RESISTANCE vs TEMPERATURE  
SWITCH-ON RESISTANCE vs +VCC  
(X+, Y+: +VCC to Pin; X, Y: Pin to GND)  
(X+, Y+: +VCC to Pin; X, Y: Pin to GND)  
8
8
7
6
5
4
3
2
1
7
6
5
4
3
2
1
X–  
Y–  
Y–  
X–  
Y+  
X+  
Y+  
X+  
40  
20  
0
20  
40  
60  
80  
100  
2.0  
2.5  
3.0  
3.5  
4.0  
4.5  
5.0  
Temperature (°C)  
+VCC (V)  
MAXIMUM SAMPLING RATE vs RIN  
INTERNAL VREF vs TEMPERATURE  
2.0  
1.8  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0
2.4920  
2.4915  
2.4910  
2.4905  
2.4900  
2.4895  
2.4890  
2.4885  
2.4880  
2.4875  
INL: R = 2k  
INL: R = 500  
DNL: R = 2k  
DNL: R = 500  
20  
40  
60  
80  
100 120 140 160 180 200  
Sampling Rate (kHz)  
Temperature (°C)  
ADS7846  
6
SBAS125H  
www.ti.com  
TYPICAL CHARACTERISTICS (Cont.)  
At TA = +25°C, +VCC = +2.7V, VREF = External +2.5V, fSAMPLE = 125kHz, and fCLK = 16 fSAMPLE = 2MHz, unless otherwise noted.  
INTERNAL VREF vs VCC  
INTERNAL VREF vs TURN-ON TIME  
2.4865  
2.4860  
2.4855  
2.4850  
2.4845  
2.4840  
100  
80  
60  
40  
20  
0
No Cap  
(52µS)  
12-Bit  
1µF Cap  
(1110µS)  
12-Bit  
Settling  
Settling  
200  
800  
1200  
0
400  
600  
1000  
Turn-On Time (µS)  
VCC (V)  
TEMP DIODE VOLTAGE  
vs TEMPERATURE (2.7V SUPPLY)  
TEMP0 DIODE VOLTAGE vs VSUPPLY (25°C)  
620  
618  
616  
614  
612  
610  
850  
800  
750  
700  
650  
600  
550  
500  
450  
TEMP1  
102.7mV  
132.25mV  
TEMP0  
3.0  
3.3  
2.7  
V
SUPPLY (V)  
Temperature (°C)  
TEMP1 DIODE VOLTAGE vs VSUPPLY (25°C)  
732  
730  
728  
726  
724  
722  
3.0  
3.3  
2.7  
V
SUPPLY (V)  
ADS7846  
SBAS125H  
7
www.ti.com  
possible to negate the error from each touch panel driver  
switchs on-resistance (if this is a source of error for the  
particular measurement).  
THEORY OF OPERATION  
The ADS7846 is a classic successive approximation register  
(SAR) analog-to-digital converter (ADC). The architecture is  
based on capacitive redistribution which inherently includes  
a sample-and-hold function. The converter is fabricated on a  
0.6µm CMOS process.  
ANALOG INPUT  
See Figure 2 for a block diagram of the input multiplexer on  
the ADS7846, the differential input of the ADC, and the  
differential reference of the converter. Table I and Table II  
show the relationship between the A2, A1, A0, and SER/DFR  
control bits and the configuration of the ADS7846. The  
control bits are provided serially via the DIN pinsee the  
Digital Interface section of this data sheet for more details.  
The basic operation of the ADS7846 is shown in Figure 1.  
The device features an internal 2.5V reference and an  
external clock. Operation is maintained from a single supply  
of 2.7V to 5.25V. The internal reference can be overdriven  
with an external, low impedance source between 1V and  
+VCC. The value of the reference voltage directly sets the  
input range of the converter.  
When the converter enters the hold mode, the voltage  
difference between the +IN and IN inputs (see Figure 2) is  
captured on the internal capacitor array. The input current  
into the analog inputs depends on the conversion rate of the  
device. During the sample period, the source must charge  
the internal sampling capacitor (typically 25pF). After the  
capacitor has been fully charged, there is no further input  
current. The rate of charge transfer from the analog source  
to the converter is a function of conversion rate.  
The analog input (X-, Y-, and Z-position coordinates, auxil-  
iary input, battery voltage, and chip temperature) to the  
converter is provided via a multiplexer. A unique configura-  
tion of low on-resistance touch panel driver switches allows  
an unselected ADC input channel to provide power and its  
accompanying pin to provide ground for an external device,  
such as a touch screen. By maintaining a differential input to  
the converter and a differential reference architecture, it is  
+2.7V to +5V  
1µF  
+
ADS7846  
DCLK 16  
to  
0.1µF  
10µF  
(Optional)  
Serial/Conversion Clock  
Chip Select  
1
2
3
4
5
6
7
8
+VCC  
X+  
CS 15  
DIN 14  
Serial Data In  
Y+  
Touch  
Screen  
Converter Status  
Serial Data Out  
Pen Interrupt  
X–  
BUSY 13  
DOUT 12  
PENIRQ 11  
+VCC 10  
Y–  
To Battery  
GND  
VBAT  
AUX  
50kΩ  
Auxiliary Input  
VREF  
9
Voltage  
Regulator  
FIGURE 1. Basic Operation of the ADS7846.  
A2  
A1  
A0  
VBAT  
AUXIN  
TEMP  
Y  
X+  
Y+  
Y-POSITION X-POSITION Z1-POSITION Z2-POSITION X-DRIVERS  
Y-DRIVERS  
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
+IN (TEMP0)  
Off  
Off  
Off  
X, On  
X, On  
On  
Off  
On  
Off  
Y+, On  
Y+, On  
Off  
+IN  
+IN  
Measure  
+IN  
Measure  
+IN  
Measure  
+IN  
Measure  
+IN  
Off  
Off  
Off  
Off  
+IN (TEMP1)  
TABLE I. Input Configuration (DIN), Single-Ended Reference Mode (SER/DFR high).  
A2  
A1  
A0  
+REF  
REF  
Y–  
X+  
Y+  
Y-POSITION  
X-POSITION  
Z1-POSITION  
Z2-POSITION  
DRIVERS ON  
0
0
1
1
0
1
0
0
1
1
0
1
Y+  
Y+  
Y+  
X+  
Y–  
X–  
X–  
X–  
+IN  
+IN  
Measure  
Y+, Y–  
Y+, X–  
Y+, X–  
X+, X–  
Measure  
+IN  
Measure  
+IN  
Measure  
TABLE II. Input Configuration (DIN), Differential Reference Mode (SER/DFR low).  
ADS7846  
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+VCC  
VREF  
PENIRQ  
TEMP1  
TEMP0  
A2-A0  
SER/DFR  
(Shown 001B)  
(Shown High)  
X+  
X–  
Ref On/Off  
Y+  
+REF  
Converter  
+IN  
Y–  
IN  
2.5V  
Reference  
REF  
7.5k  
VBAT  
2.5kΩ  
Battery  
On  
AUX  
GND  
FIGURE 2. Simplified Diagram of Analog Input.  
INTERNAL REFERENCE  
Reference  
Power Down  
The ADS7846 has an internal 2.5V voltage reference that can  
be turned on or off with the control bit, PD1 = 1 (see Table V and  
Figure 3). Typically, the internal reference voltage is only used  
in the single-ended mode for battery monitoring, temperature  
measurement, and for using the auxiliary input. Optimal touch  
screen performance is achieved when using the differential  
mode. The internal reference voltage of the ADS7846 must be  
commanded to be off to maintain compatibility with the ADS7843.  
Therefore, after power-up, a write of PD1 = 0 is required to  
insure the reference is off (see the Typical Characteristics for  
power-up time of the reference from power-down).  
VREF  
Band  
Gap  
Buffer  
Optional  
To  
CDAC  
FIGURE 3. Simplified Diagram of the Internal Reference.  
REFERENCE INPUT  
The voltage difference between +REF and REF (shown in  
Figure 2) sets the analog input range. The ADS7846 oper-  
ates with a reference in the range of 1V to +VCC. There are  
several critical items concerning the reference input and its  
wide voltage range. As the reference voltage is reduced, the  
analog voltage weight of each digital output code is also  
reduced. This is often referred to as the LSB (least significant  
bit) size and is equal to the reference voltage divided by 4096  
in 12-bit mode. Any offset or gain error inherent in the ADC  
appears to increase, in terms of LSB size, as the reference  
voltage is reduced. For example, if the offset of a given  
converter is 2LSBs with a 2.5V reference, it is typically  
5LSBs with a 1V reference. In each case, the actual offset of  
the device is the same, 1.22mV. With a lower reference  
ADS7846  
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voltage, more care must be taken to provide a clean layout  
including adequate bypassing, a clean (low-noise, low-ripple)  
power supply, a low-noise reference (if an external reference  
is used), and a low-noise input signal.  
+VCC  
The voltage into the VREF input directly drives the capacitor  
digital-to-analog converter (CDAC) portion of the ADS7846.  
Therefore, the input current is very low (typically < 13µA).  
Y+  
There is also a critical item regarding the reference when  
making measurements where the switch drivers are on. For  
this discussion, it is useful to consider the basic operation of  
the ADS7846 (see Figure 1). This particular application  
shows the device being used to digitize a resistive touch  
screen. A measurement of the current Y position of the  
pointing device is made by connecting the X+ input to the  
ADC, turning on the Y+ and Ydrivers, and digitizing the  
voltage on X+ (Figure 4 shows a block diagram). For this  
measurement, the resistance in the X+ lead does not affect  
the conversion (it does affect the settling time, but the  
resistance is usually small enough that this is not a concern).  
However, since the resistance between Y+ and Yis fairly  
low, the on-resistance of the Y drivers does make a small  
difference. Under the situation outlined so far, it is not  
possible to achieve a 0V input or a full-scale input regardless  
of where the pointing device is on the touch screen, because  
some voltage is lost across the internal switches. In addition,  
the internal switch resistance is unlikely to track the resis-  
tance of the touch screen, providing an additional source of error.  
+REF  
Converter  
REF  
+IN  
X+  
IN  
Y–  
GND  
FIGURE 5. Simplified Diagram of Differential Reference  
SER/DFR Low, Y Switches Enabled, X+ is  
(
Analog Input).  
As a final note about the differential reference mode, it must  
be used with +VCC as the source of the +REF voltage and  
cannot be used with VREF. It is possible to use a high  
precision reference on VREF and single-ended reference  
mode for measurements which do not need to be ratiometric.  
In some cases, it is possible to power the converter directly  
from a precision reference. Most references can provide  
enough power for the ADS7846, but might not be able to  
supply enough current for the external load (such as a  
resistive touch screen).  
+VCC  
VREF  
TOUCH SCREEN SETTLING  
Y+  
In some applications, external capacitors may be required  
across the touch screen for filtering noise picked up by the  
touch screen (for example, noise generated by the LCD panel  
or backlight circuitry). These capacitors provide a low-pass  
filter to reduce the noise, but cause a settling time requirement  
when the panel is touched that typically shows up as a gain  
error. The problem is that the input and/or reference has not  
settled to the final steady-state value prior to the ADC sam-  
pling the input(s) and providing the digital output. Additionally,  
the reference voltage may still be changing during the mea-  
surement cycle. There are several methods for minimizing or  
eliminating this issue. Option 1 is to stop or slow down the  
ADS7846 DCLK for the required touch screen settling time.  
This allows the input and reference to have stable values for  
the Acquire period (3 clock cycles of the ADS7846; see Figure  
9). This works for both the single-ended and the differential  
modes. Option 2 is to operate the ADS7846 in the differential  
mode only for the touch screen measurements and command  
the ADS7846 to remain on (touch screen drivers on) and not  
go into power-down (PD0 = 1). Several conversions are made  
depending on the settling time required and the ADS7846 data  
rate. Once the required number of conversions have been  
made, the processor commands the ADS7846 to go into the  
power-down state on the last measurement. This process is  
+REF  
Converter  
REF  
+IN  
X+  
IN  
Y–  
GND  
FIGURE 4. Simplified Diagram of Single-Ended Reference  
SER/DFR High, Y Switches Enabled, X+ is  
(
Analog Input).  
This situation can be remedied as shown in Figure 5. By  
setting the SER/DFR bit low, the +REF and REF inputs are  
connected directly to Y+ and Y, respectively, which makes  
the analog-to-digital conversion ratiometric. The result of the  
conversion is always a percentage of the external resistance,  
regardless of how it changes in relation to the on-resistance of  
the internal switches. Note that there is an important consid-  
eration regarding power dissipation when using the ratiometric  
mode of operation (see the Power Dissipation section for  
more details).  
ADS7846  
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required for X-position, Y-position, and Z-position measure-  
ments. Option 3 is to operate in the 15 Clock-per-Conversion  
mode which overlaps the analog-to-digital conversions and  
maintains the touch screen drivers on until commanded to  
stop by the processor (see Figure 12).  
represented by kT/q ln (N), where N is the current ratio  
= 91, k = Boltzmanns constant (1.38054 1023 electron  
volts/degrees Kelvin), q = the electron charge (1.602189 •  
1019 C), and T = the temperature in degrees Kelvin. This  
method can provide improved absolute temperature mea-  
surement over the first mode at the cost of less resolution  
(1.6°C/LSB). The equation for solving for °K is:  
TEMPERATURE MEASUREMENT  
°K = q V/(k ln (N))  
V = V (I91) V (I1) (in mV)  
°K = 2.573°K/mV V  
(1)  
In some applications, such as battery recharging, a measure-  
ment of ambient temperature is required. The temperature  
measurement technique used in the ADS7846 relies on the  
characteristics of a semiconductor junction operating at a  
fixed current level. The forward diode voltage (VBE) has a  
well-defined characteristic versus temperature. The ambient  
temperature can be predicted in applications by knowing the  
25°C value of the VBE voltage and then monitoring the delta  
of that voltage as the temperature changes. The ADS7846  
offers two modes of operation. The first mode requires  
calibration at a known temperature, but only requires a single  
reading to predict the ambient temperature. The PENIRQ  
diode is used (turned on) during this measurement cycle.  
The voltage across the diode is connected through the MUX  
for digitizing the forward bias voltage by the ADC with an  
address of A2 = 0, A1 = 0, and A0 = 0 (see Table I and Figure  
6 for details). This voltage is typically 600mV at +25°C with  
a 20µA current through the diode. The absolute value of this  
diode voltage can vary a few millivolts. However, the TC of  
this voltage is very consistent at 2.1mV/°C. During the final  
test of the end product, the diode voltage would be stored at  
a known room temperature, in memory, for calibration pur-  
poses by the user. The result is an equivalent temperature  
measurement resolution of 0.3°C/LSB (in 12-bit mode).  
where,  
°C = 2.573 V(mV) 273°K  
NOTE: The bias current for each diode temperature mea-  
surement is only on for 3 clock cycles (during the acquisition  
mode). Therefore, it does not add any noticeable increase in  
power, especially if the temperature measurement only oc-  
curs occasionally.  
BATTERY MEASUREMENT  
An added feature of the ADS7846 is the ability to monitor the  
battery voltage on the other side of the voltage regulator (DC/DC  
converter), as shown in Figure 7. The battery voltage can vary  
from 0.5V to 6V, while maintaining the voltage to the ADS7846  
at 2.7V, 3.3V, etc. The input voltage (VBAT) is divided down by  
4 so that a 6.0V battery voltage is represented as 1.5V to the  
ADC. This simplifies the multiplexer and control logic. In order  
to minimize the power consumption, the divider is only on  
during the sampling period when A2 = 0, A1 = 1, and A0 = 0  
(see Table I for the relationship between the control bits and  
configuration of the ADS7846).  
+VCC  
External  
Pull-Up  
2.7V  
DC/DC  
Converter  
X+  
Battery  
0.5V  
PENIRQ  
MUX  
+
ADC  
to  
6.0V  
+VCC  
0.125V to 1.5V  
Temperature Select  
VBAT  
TEMP0 TEMP1  
7.5k  
2.5kΩ  
FIGURE 6. Functional Block Diagram of Temperature Mea-  
surement Mode.  
The second mode does not require a test temperature  
calibration, but uses a two-measurement method to eliminate  
the need for absolute temperature calibration and for achiev-  
ing 2°C accuracy. This mode requires a second conversion  
with an address of A2 = 1, A1 = 1, and A0 = 1, with a 91 times  
larger current. The voltage difference between the first  
and second conversion using 91 times the bias current is  
FIGURE 7. Battery Measurement Functional Block Diagram.  
ADS7846  
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PRESSURE MEASUREMENT  
Measure X-Position  
Measuring touch pressure can also be done with the ADS7846.  
To determine pen or finger touch, the pressure of the touch  
needs to be determined. Generally, it is not necessary to have  
very high performance for this test; therefore, the 8-bit resolu-  
tion mode is recommended (however, calculations will be  
shown here are in 12-bit resolution mode). There are several  
different ways of performing this measurement. The ADS7846  
supports two methods. The first method requires knowing the  
X-plate resistance, measurement of the X-Position, and two  
additional cross-panel measurements (Z1 and Z2) of the touch  
screen, as shown in Figure 8. Using Equation 2 calculates the  
touch resistance:  
X+  
Y+  
Y–  
Touch  
X-Position  
X–  
Measure Z1-Position  
Y+  
X+  
Touch  
X Position Z2  
Z1-Position  
X–  
RTOUCH = RX plate•  
1  
(2)  
4096  
Z1  
Y–  
The second method requires knowing both the X-plate and  
Y-plate resistance, measurement of X-Position and Y-Posi-  
tion, and Z1. Using Equation 3 also calculates the touch  
resistance:  
Y+  
X+  
Touch  
RX plate X Position  
4096  
Z1  
RTOUCH  
=
1  
4096  
Z2-Position  
(3)  
Y Position  
RY plate 1–  
X–  
Y–  
Measure Z2-Position  
4096  
FIGURE 8. Pressure Measurement Block Diagrams.  
DIGITAL INTERFACE  
Figure 9 shows the typical operation of the ADS7846 digital  
interface. This diagram assumes that the source of the  
digital signals is a microcontroller or digital signal processor  
with a basic serial interface. Each communication between  
the processor and the converter, such as SPI/SSI or  
Microwiresynchronous serial interface, consists of eight  
clock cycles. One complete conversion can be accom-  
plished with three serial communications for a total of 24  
clock cycles on the DCLK input.  
The first eight clock cycles are used to provide the control  
byte via the DIN pin. When the converter has enough  
information about the following conversion to set the input  
multiplexer and reference inputs appropriately, the converter  
enters the acquisition (sample) mode and, if needed,  
the touch panel drivers are turned on. After three more  
clock cycles, the control byte is complete and the converter  
enters the conversion mode. At this point, the input  
CS  
tACQ  
DCLK  
DIN  
1
8
1
8
1
8
SER/  
DFR  
S
A2 A1 A0 MODE  
Idle  
PD1 PD0  
Acquire  
(START)  
Conversion  
Idle  
BUSY  
DOUT  
11 10  
(MSB)  
9
8
7
6
5
4
3
2
1
0
Zero Filled...  
(LSB)  
DRIVERS 1 AND 2(1)  
(SER/DFR High)  
Off  
Off  
On  
Off  
DRIVERS 1 AND 2(1, 2)  
(SER/DFR Low)  
On  
Off  
NOTES: (1) For Y-Position, Driver 1 is on, X+ is selected, and Driver 2 is off. For X-Position, Driver 1 is off, Y+ is selected, and  
Driver 2 is on. Ywill turn on when power-down mode is entered and PD0 = 0B. (2) Drivers will remain on if PD0 = 1 (no power  
down) until selected input channel, reference mode, or power-down mode is changed, or CS is HIGH.  
FIGURE 9. Conversion Timing, 24 Clocks-per-Conversion, 8-bit Bus Interface. No DCLK delay required with dedicated  
serial port.  
ADS7846  
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SER/DFRThe SER/DFR bit controls the reference mode,  
either single-ended (high) or differential (low). The differential  
mode is also referred to as the ratiometric conversion mode  
and is preferred for X-Position, Y-Position, and Pressure-  
Touch measurements for optimum performance. The refer-  
ence is derived from the voltage at the switch drivers, which  
is almost the same as the voltage to the touch screen. In this  
case a reference voltage is not needed, as the reference  
voltage to the ADC is the voltage across the touch screen. In  
the single-ended mode, the converter reference voltage is  
always the difference between the VREF and GND pins (see  
Tables I and II, and Figures 2 through 5 for further informa-  
tion).  
sample-and-hold goes into the hold mode and the touch  
panel drivers turn off (in single-ended mode). The next 12  
clock cycles accomplish the actual analog-to-digital conver-  
sion. If the conversion is ratiometric (SER/DFR = 0), the  
drivers are on during the conversion and a 13th clock cycle  
is needed for the last bit of the conversion result. Three more  
clock cycles are needed to complete the last byte (DOUT will  
be low), which are ignored by the converter.  
Control Byte  
The control byte (on DIN), as shown in Table III, provides the  
start conversion, addressing, ADC resolution, configuration,  
and power-down of the ADS7846. Figure 9 and Tables III  
and IV give detailed information regarding the order and  
description of these control bits within the control byte.  
If X-Position, Y-Position, and Pressure-Touch are measured  
in the single-ended mode, an external reference voltage is  
needed. The ADS7846 should also be powered from the  
external reference. Caution must be observed when using  
the single-ended mode such that the input voltage to the  
ADC does not exceed the internal reference voltage, espe-  
cially if the supply voltage is greater than 2.7V.  
Bit 7  
Bit 0  
(MSB)  
Bit 6  
Bit 5  
Bit 4  
Bit 3  
Bit 2  
Bit 1  
(LSB)  
S
A2  
A1  
A0  
MODE SER/DFR PD1  
PD0  
TABLE III. Order of the Control Bits in the Control Byte.  
NOTE: The differential mode can only be used for X-Position,  
Y-Position, and Pressure-Touch measurements. All other  
measurements require the single-ended mode.  
BIT  
NAME  
DESCRIPTION  
7
S
Start Bit. Control byte starts with first high bit on DIN.  
A new control byte can start every 15th clock cycle  
in 12-bit conversion mode or every 11th clock cycle  
in 8-bit conversion mode (see Figure 12).  
PD0 and PD1Table V describes the power-down and the  
internal reference voltage configurations. The internal refer-  
ence voltage can be turned on or off independently of the  
ADC. This can allow extra time for the internal reference  
voltage to settle to the final value prior to making a conver-  
sion. Make sure to also allow this extra wake-up time if the  
internal reference is powered down. The ADC requires no  
wake-up time and can be instantaneously used. Also note  
that the status of the internal reference power-down is  
latched into the part (internally) with BUSY going high.  
Therefore, in order to turn the reference off, an additional  
write to the ADS7846 is required after the channel is con-  
verted.  
6-4  
A2-A0  
MODE  
Channel Select Bits. Along with the SER/DFR bit,  
these bits control the setting of the multiplexer input,  
touch driver switches, and reference inputs (see  
Tables I and II).  
3
2
12-Bit/8-Bit Conversion Select Bit. This bit controls  
the number of bits for the next conversion: 12-bits  
(low) or 8-bits (high).  
SER/DFR Single-Ended/Differential Reference Select Bit. Along  
with bits A2-A0, this bit controls the setting of the  
multiplexer input, touch driver switches, and reference  
inputs (see Tables I and I).  
1-0  
PD1-PD0 Power-Down Mode Select Bits. See Table V for  
details.  
TABLE IV. Descriptions of the Control Bits within the Control  
Byte.  
PD1 PD0 PENIRQ DESCRIPTION  
0
0
Enabled Power-Down Between Conversions. When each  
conversion is finished, the converter enters a  
low-power mode. At the start of the next conver-  
sion, the device instantly powers up to full power.  
There is no need for additional delays to assure  
full operation and the very first conversion is  
valid. The Yswitch is on when in power-down.  
Initiate STARTThe first bit, the S bit, must always be high  
and initiates the start of the control byte. The ADS7846  
ignores inputs on the DIN pin until the start bit is detected.  
AddressingThe next three bits (A2, A1, and A0) select the  
active input channel(s) of the input multiplexer (see Tables I,  
II, and Figure 2), touch screen drivers, and the reference  
inputs.  
0
1
1
1
0
Disabled Reference is off and ADC is on.  
Enabled Reference is on and ADC is off.  
1
Disabled Device is always powered. Reference is on and  
ADC is on.  
MODEThe mode bit sets the resolution of the ADC. With  
this bit low, the next conversion has 12 bits of resolution; with  
this bit high, the next conversion has 8 bits of resolution.  
TABLE V. Power-Down and Internal Reference Selection.  
ADS7846  
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16 Clocks-per-Conversion  
SYMBOL  
DESCRIPTION  
MIN  
TYP  
MAX  
UNITS  
tACQ  
tDS  
Acquisition Time  
1.5  
µs  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
ns  
The control bits for conversion n + 1 can be overlapped with  
conversion n to allow for a conversion every 16 clock cycles,  
as shown in Figure 10. This figure also shows possible serial  
communication occurring with other serial peripherals be-  
tween each byte transfer from the processor to the converter.  
This is possible provided that each conversion completes  
within 1.6ms of starting. Otherwise, the signal that is cap-  
tured on the input sample-and-hold may droop enough to  
affect the conversion result. Note that the ADS7846 is fully  
powered while other serial communications are taking place  
during a conversion.  
DIN Valid Prior to DCLK Rising 100  
tDH  
DIN Hold After DCLK High  
DCLK Falling to DOUT Valid  
CS Falling to DOUT Enabled  
CS Rising to DOUT Disabled  
10  
tDO  
tDV  
200  
200  
200  
tTR  
tCSS  
tCSH  
tCH  
CS Falling to First DCLK Rising 100  
CS Rising to DCLK Ignored  
DCLK High  
0
200  
200  
tCL  
DCLK Low  
tBD  
DCLK Falling to BUSY Rising  
CS Falling to BUSY Enabled  
CS Rising to BUSY Disabled  
200  
200  
200  
tBDV  
tBTR  
Digital Timing  
Figures 9, 11, and Table VI provide detailed timing for the  
digital interface of the ADS7846.  
TABLE VI. Timing Specifications (+VCC = +2.7V and Above,  
TA = 40°C to +85°C, CLOAD = 50pF).  
CS  
DCLK  
1
8
1
8
1
8
1
DIN  
BUSY  
DOUT  
S
S
Control Bits  
Control Bits  
11 10  
9
8
7
6
5
4
3
2
1
0
11 10 9  
FIGURE 10. Conversion Timing, 16 Clocks-per-Conversion, 8-Bit Bus Interface. No DCLK delay required with dedicated  
serial port.  
CS  
tCL  
tCSH  
tCSS  
tCH  
tBD  
tBD  
tD0  
DCLK  
DIN  
tDH  
tDS  
PD0  
tBDV  
tBTR  
BUSY  
DOUT  
tDV  
tTR  
11  
10  
FIGURE 11. Detailed Timing Diagram.  
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15 Clocks-per-Conversion  
8-Bit Conversion  
Figure 12 provides the fastest way to clock the ADS7846.  
This method does not work with the serial interface of most  
microcontrollers and digital signal processors, as they are  
generally not capable of providing 15 clock cycles per serial  
transfer. However, this method can be used with field pro-  
grammable gate arrays (FPGAs) or application specific inte-  
grated circuits (ASICs). Note that this effectively increases  
the maximum conversion rate of the converter beyond the  
values given in the specification tables, which assume 16  
clock cycles per conversion.  
The ADS7846 provides an 8-bit conversion mode that can be  
used when faster throughput is needed and the digital result  
is not as critical. By switching to the 8-bit mode, a conversion  
is complete four clock cycles earlier. Not only does this shorten  
each conversion by four bits (25% faster throughput), but each  
conversion can actually occur at a faster clock rate. This is  
because the internal settling time of the ADS7846 is not as  
criticalsettling to better than 8 bits is all that is needed. The  
clock rate can be as much as 50% faster. The faster clock rate  
and fewer clock cycles combine to provide a 2x increase in  
conversion rate.  
Data Format  
The ADS7846 output data is in Straight Binary format as  
shown in Figure 13. This figure shows the ideal output code  
for the given input voltage and does not include the effects  
of offset, gain, or noise.  
POWER DISSIPATION  
There are two major power modes for the ADS7846: full power  
(PD0 = 1B) and auto power-down (PD0 = 0B). When operating  
at full speed and 16 clocks-per-conversion (see Figure 10), the  
ADS7846 spends most of the time acquiring or converting.  
There is little time for auto power-down, assuming that this  
mode is active. Therefore, the difference between full-power  
mode and auto power-down is negligible. If the conversion  
rate is decreased by slowing the frequency of the DCLK input,  
the two modes remain approximately equal. However, if the  
DCLK frequency is kept at the maximum rate during a conver-  
sion but conversions are done less often, the difference  
between the two modes is dramatic.  
(1)  
FS = Full-Scale Voltage = VREF  
1LSB = VREF(1)/4096  
1LSB  
11...111  
11...110  
11...101  
00...010  
00...001  
00...000  
0V  
FS 1LSB  
Input Voltage(2) (V)  
NOTES: (1) Reference voltage at converter: +REF (REF), see Figure 2.  
(2) Input voltage at converter, after multiplexer: +IN (IN), see Figure 2.  
FIGURE 13. Ideal Input Voltages and Output Codes.  
CS  
Power Down  
DCLK  
1
15  
1
15  
1
SGL/  
DIF  
SGL/  
DIF  
DIN  
BUSY  
DOUT  
S
A2 A1 A0 MODE  
PD1 PD0  
S
A2 A1 A0 MODE  
PD1 PD0  
S
A2 A1 A0  
Tri-State  
11 10  
9
8
7
6
5
4
3
2
1
0
11 10  
9
8
7
FIGURE 12. Maximum Conversion Rate, 15 Clocks-per-Conversion.  
ADS7846  
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Figure 14 shows the difference between reducing the DCLK  
frequency (scaling DCLK to match the conversion rate) or  
maintaining DCLK at the highest frequency and reducing the  
number of conversions per second. In the latter case, the  
converter spends an increasing percentage of time in power-  
down mode (assuming the auto power-down mode is active).  
LAYOUT  
The following layout suggestions provide the most optimum  
performance from the ADS7846. However, many portable  
applications have conflicting requirements concerning power,  
cost, size, and weight. In general, most portable devices  
have fairly clean power and grounds because most of the  
internal components are very low power. This situation means  
less bypassing for the converter power and less concern  
regarding grounding. Still, each situation is unique and the  
following suggestions should be reviewed carefully.  
1000  
fCLK = 16 fSAMPLE  
For optimum performance, care must be taken with the  
physical layout of the ADS7846 circuitry. The basic SAR  
architecture is sensitive to glitches or sudden changes on the  
power supply, reference, ground connections, and digital  
inputs that occur just prior to latching the output of the analog  
comparator. Therefore, during any single conversion for an  
n-bit SAR converter, there are n windowsin which large  
external transient voltages can easily affect the conversion  
result. Such glitches can originate from switching power  
supplies, nearby digital logic, and high-power devices. The  
degree of error in the digital output depends on the reference  
voltage, layout, and the exact timing of the external event.  
The error can change if the external event changes in time  
with respect to the DCLK input.  
100  
fCLK = 2MHz  
10  
TA = 25°C  
+VCC = +2.7V  
1
1k  
10k  
100k  
1M  
f
SAMPLE (Hz)  
FIGURE 14. Supply Current versus Directly Scaling the Fre-  
quency of DCLK with Sample Rate or Maintain-  
ing DCLK at the Maximum Possible Frequency.  
With this in mind, power to the ADS7846 should be clean and  
well bypassed. A 0.1µF ceramic bypass capacitor should be  
placed as close to the device as possible. A 1µF to 10µF  
capacitor may also be needed if the impedance of the  
connection between +VCC and the power supply is high. Low-  
leakage capacitors should be used to minimize power dissi-  
pation through the bypass capacitors when the ADS7846 is  
in power-down mode.  
Another important consideration for power dissipation is the  
reference mode of the converter. In the single-ended refer-  
ence mode, the touch panel drivers are on only when the  
analog input voltage is being acquired (see Figure 9 and  
Table I). Therefore, the external device (e.g., a resistive  
touch screen) is only powered during the acquisition period.  
In the differential reference mode, the external device must  
be powered throughout the acquisition and conversion peri-  
ods (see Figure 9). If the conversion rate is high, this could  
substantially increase power dissipation.  
A bypass capacitor is generally not needed on the VREF pin  
because the internal reference is buffered by an internal op  
amp. If an external reference voltage originates from an op  
amp, make sure that it can drive any bypass capacitor that  
is used without oscillation.  
CS also puts the ADS7846 into power-down mode. When  
CS goes high, the ADS7846 immediately goes into power-  
down and does not complete the current conversion. How-  
ever, the internal reference does not turn off with CS going  
high. To turn the reference off, an additional write is required  
before CS goes high (PD1 = 0).  
The ADS7846 architecture offers no inherent rejection of  
noise or voltage variation in regards to using an external  
reference input. This is of particular concern when the  
reference input is tied to the power supply. Any noise and  
ripple from the supply appears directly in the digital results.  
Whereas high-frequency noise can be filtered out, voltage  
variation due to line frequency (50Hz or 60Hz) can be difficult  
to remove.  
ADS7846  
16  
SBAS125H  
www.ti.com  
The GND pin must be connected to a clean ground point. In  
many cases, this is the analog ground. Avoid connections  
which are too near the grounding point of a microcontroller or  
digital signal processor. If needed, run a ground trace directly  
from the converter to the power-supply entry or battery-  
connection point. The ideal layout includes an analog ground  
plane dedicated to the converter and associated analog  
circuitry.  
+VCC  
100k  
Y+  
PENIRQ  
In the specific case of use with a resistive touch screen, care  
should be taken with the connection between the converter  
and the touch screen. Although resistive touch screens have  
fairly low resistance, the interconnection should be as short  
and robust as possible. Longer connections are a source of  
error, much like the on-resistance of the internal switches.  
Likewise, loose connections can be a source of error when  
the contact resistance changes with flexing or vibrations.  
X+  
Y–  
On  
Y or X drivers on,  
As indicated previously, noise can be a major source of error  
in touch screen applications (for example, applications that  
require a backlit LCD panel). This EMI noise can be coupled  
through the LCD panel to the touch screen and cause  
flickeringof the converted data. Several things can be done  
to reduce this error, such as using a touch screen with a  
bottom-side metal layer connected to ground to shunt the  
majority of noise to ground. Additionally, filtering capacitors,  
from Y+, Y, X+, and Xpins to ground can also help.  
Caution should be observed under these circumstances for  
settling time of the touch screen, especially operating in the  
single-ended mode and at high data rates.  
or TEMP0, TEMP1  
measurements  
activated.  
FIGURE 15. ADS7846 PENIRQ Functional Block Diagram.  
Furthermore, the PENIRQ output is disabled and low during  
the measurement cycle for X-, Y-, and Z-Position. The PENIRQ  
output is disabled and high during the measurement cycle for  
battery monitor, auxiliary input, and chip temperature. If the last  
control byte written to the ADS7846 contains PD0 = 1, the pen-  
interrupt output function is disabled and is not able to detect  
when the screen is touched. In order to re-enable the pen-  
interrupt output function under these circumstances, a control  
byte needs to be written to the ADS7846 with PD0 = 0. If the  
last control byte written to the ADS7846 contains PD0 = 0, the  
pen-interrupt output function is enabled at the end of the  
conversion. The end of the conversion occurs on the falling  
edge of DCLK after bit 1 of the converted data is clocked out  
of the ADS7846.  
PENIRQ OUTPUT  
The pen-interrupt output function is shown in Figure 15. While  
in power-down mode with PD0 = 0, the Ydriver is on and  
connects the Y-plane of the touch screen to GND. The  
PENIRQ output is connected to the X+ input through two  
transmission gates. When the screen is touched, the X+ input  
is pulled to ground through the touch screen. The PENIRQ  
output goes low due to the current path through the touch  
screen to ground, which initiates an interrupt to the processor.  
During the measurement cycle for X-, Y-, and Z-Position, the  
X+ input is disconnected from the external pull-up resistor.  
This is done to eliminate any leakage current from the  
external pull-up resistor through the touch screen, thus caus-  
ing no errors.  
It is recommended that the processor mask the interrupt  
PENIRQ is associated with whenever the processor sends a  
control byte to the ADS7846. This prevents false triggering  
of interrupts when the PENIRQ output is disabled, as in the  
cases discussed in this section.  
ADS7846  
SBAS125H  
17  
www.ti.com  
PACKAGE OPTION ADDENDUM  
www.ti.com  
1-Mar-2005  
PACKAGING INFORMATION  
Orderable Device  
ADS7846E  
Status (1)  
ACTIVE  
ACTIVE  
ACTIVE  
Package Package  
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)  
Qty  
Type  
Drawing  
SSOP/  
QSOP  
DBQ  
16  
16  
16  
100  
None  
CU NIPDAU Level-3-220C-168 HR  
ADS7846E/2K5  
ADS7846E/2K5G4  
SSOP/  
QSOP  
DBQ  
DBQ  
2500  
None  
CU NIPDAU Level-3-220C-168 HR  
SSOP/  
QSOP  
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
ADS7846IGQCR  
ADS7846IRGVR  
ADS7846IRGVT  
ADS7846N  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
VFBGA  
QFN  
GQC  
RGV  
RGV  
PW  
48  
16  
16  
16  
16  
16  
2500  
2500  
250  
None  
None  
None  
None  
None  
SNPB  
Level-2A-235C-4 WKS  
CU NIPDAU Level-1-220C-UNLIM  
CU NIPDAU Level-3-220C-168 HR  
QFN  
TSSOP  
TSSOP  
TSSOP  
94  
CU SNPB  
CU SNPB  
Level-3-220C-168 HR  
Level-3-220C-168 HR  
ADS7846N/2K5  
ADS7846N/2K5G4  
PW  
2500  
PW  
2500 Green (RoHS & CU NIPDAU Level-2-260C-1 YEAR  
no Sb/Br)  
(1) The marketing status values are defined as follows:  
ACTIVE: Product device recommended for new designs.  
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.  
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in  
a new design.  
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.  
OBSOLETE: TI has discontinued the production of the device.  
(2)  
Eco Plan - May not be currently available - please check http://www.ti.com/productcontent for the latest availability information and additional  
product content details.  
None: Not yet available Lead (Pb-Free).  
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements  
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered  
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.  
Green (RoHS & no Sb/Br): TI defines "Green" to mean "Pb-Free" and in addition, uses package materials that do not contain halogens,  
including bromine (Br) or antimony (Sb) above 0.1% of total product weight.  
(3)  
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDECindustry standard classifications, and peak solder  
temperature.  
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is  
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the  
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take  
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on  
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited  
information may not be available for release.  
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI  
to Customer on an annual basis.  
Addendum-Page 1  
MECHANICAL DATA  
MPLG008D – APRIL 2000 – REVISED FEBRUARY 2002  
GQC (S-PBGA-N48)  
PLASTIC BALL GRID ARRAY  
4,10  
3,90  
SQ  
3,00 TYP  
0,50  
G
F
0,50  
E
D
C
B
A
3,00 TYP  
1
2
3
4
5
6
7
A1 Corner  
Bottom View  
0,77  
0,71  
1,00 MAX  
Seating Plane  
0,08  
0,35  
0,25  
0,15  
0,25  
0,05  
M
4200460/E 01/02  
NOTES: A. All linear dimensions are in millimeters.  
B. This drawing is subject to change without notice.  
C. MicroStar Junior BGA configuration  
D. Falls within JEDEC MO-225  
MicroStar Junior is a trademark of Texas Instruments.  
1
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
MECHANICAL DATA  
MTSS001C – JANUARY 1995 – REVISED FEBRUARY 1999  
PW (R-PDSO-G**)  
PLASTIC SMALL-OUTLINE PACKAGE  
14 PINS SHOWN  
0,30  
0,19  
M
0,10  
0,65  
14  
8
0,15 NOM  
4,50  
4,30  
6,60  
6,20  
Gage Plane  
0,25  
1
7
0°8°  
A
0,75  
0,50  
Seating Plane  
0,10  
0,15  
0,05  
1,20 MAX  
PINS **  
8
14  
16  
20  
24  
28  
DIM  
3,10  
2,90  
5,10  
4,90  
5,10  
4,90  
6,60  
6,40  
7,90  
9,80  
9,60  
A MAX  
A MIN  
7,70  
4040064/F 01/97  
NOTES: A. All linear dimensions are in millimeters.  
B. This drawing is subject to change without notice.  
C. Body dimensions do not include mold flash or protrusion not to exceed 0,15.  
D. Falls within JEDEC MO-153  
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
IMPORTANT NOTICE  
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,  
enhancements, improvements, and other changes to its products and services at any time and to discontinue  
any product or service without notice. Customers should obtain the latest relevant information before placing  
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms  
and conditions of sale supplied at the time of order acknowledgment.  
TI warrants performance of its hardware products to the specifications applicable at the time of sale in  
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI  
deems necessary to support this warranty. Except where mandated by government requirements, testing of all  
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Applications  
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Amplifiers  
amplifier.ti.com  
www.ti.com/audio  
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dataconverter.ti.com  
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www.ti.com/automotive  
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dsp.ti.com  
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www.ti.com/broadband  
www.ti.com/digitalcontrol  
www.ti.com/military  
Interface  
Logic  
interface.ti.com  
logic.ti.com  
Power Mgmt  
Microcontrollers  
power.ti.com  
Optical Networking  
Security  
www.ti.com/opticalnetwork  
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Post Office Box 655303 Dallas, Texas 75265  
Copyright 2005, Texas Instruments Incorporated  
配单直通车
ADS7846E/2K5产品参数
型号:ADS7846E/2K5
是否Rohs认证: 不符合
生命周期:Transferred
IHS 制造商:BURR-BROWN CORP
包装说明:SSOP-16
Reach Compliance Code:unknown
风险等级:5.72
Is Samacsys:N
最大模拟输入电压:2.5 V
最小模拟输入电压:
最长转换时间:6 µs
转换器类型:ADC, SUCCESSIVE APPROXIMATION
JESD-30 代码:R-PDSO-G16
JESD-609代码:e0
长度:4.9 mm
最大线性误差 (EL):0.0488%
模拟输入通道数量:4
位数:12
功能数量:1
端子数量:16
最高工作温度:85 °C
最低工作温度:-40 °C
输出位码:BINARY
输出格式:SERIAL
封装主体材料:PLASTIC/EPOXY
封装代码:SSOP
封装等效代码:SSOP16,.25
封装形状:RECTANGULAR
封装形式:SMALL OUTLINE
电源:2.7 V
认证状态:Not Qualified
采样速率:0.125 MHz
采样并保持/跟踪并保持:SAMPLE
子类别:Analog to Digital Converters
标称供电电压:2.7 V
表面贴装:YES
技术:CMOS
温度等级:INDUSTRIAL
端子面层:Tin/Lead (Sn/Pb)
端子形式:GULL WING
端子节距:0.635 mm
端子位置:DUAL
Base Number Matches:1
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