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ADS7845E 参数 Datasheet PDF下载

ADS7845E图片预览
型号: ADS7845E
PDF下载: 下载PDF文件 查看货源
内容描述: 触摸屏控制器 [TOUCH SCREEN CONTROLLER]
分类和应用: 转换器模数转换器光电二极管控制器
文件页数/大小: 12 页 / 175 K
品牌: BURR-BROWN [ BURR-BROWN CORPORATION ]
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®
ADS
784
ADS7845
5
TOUCH SCREEN CONTROLLER
FEATURES
q
5-WIRE TOUCH SCREEN INTERFACE
q
RATIOMETRIC CONVERSION
q
SINGLE SUPPLY: 2V to 5V
q
UP TO 125kHz CONVERSION RATE
q
SERIAL INTERFACE
q
PROGRAMMABLE 8- OR 12-BIT RESOLUTION
q
AUXILIARY ANALOG INPUTS
q
FULL POWER-DOWN CONTROL
DESCRIPTION
The ADS7845 is a 12-bit sampling analog-to-digital
converter (ADC) with a synchronous serial interface
and low on-resistance switches for driving touch
screens. Typical power dissipation is 750µW at a
125kHz throughput rate and a +2.7V supply. The
reference voltage (V
REF
) can be varied between 1V and
+V
CC
, providing a corresponding input voltage range
of 0V to V
REF
. The device includes a shutdown mode
which reduces typical power dissipation to under
0.5µW. The ADS7845 is guaranteed down to 2.7V
operation.
Low power, high speed, and on-board switches make
the ADS7845 ideal for battery-operated systems such
as personal digital assistants with resistive touch screens
and other portable equipment. The ADS7845 is avail-
able in a 16-lead SSOP package and is guaranteed
over the –40°C to +85°C temperature range.
APPLICATIONS
q
PERSONAL DIGITAL ASSISTANTS
q
PORTABLE INSTRUMENTS
q
POINT-OF-SALES TERMINALS
q
PAGERS
q
TOUCH-SCREEN MONITORS
+V
CC
GND
UR
LR
GND
Driver
+V
CC
UL
LL
SAR
ADS7845
DOUT
BUSY
Comparator
+V
CC
GND
CDAC
Serial
Data
Interface
and
Control
CS
AUX IN
WIPER
PENIRQ
MUX
DCLK
DIN
V
REF
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©
1998 Burr-Brown Corporation
PDS-1497A
Printed in U.S.A. December, 1998