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LTC1857 参数 Datasheet PDF下载

LTC1857图片预览
型号: LTC1857
PDF下载: 下载PDF文件 查看货源
内容描述: 8通道, 12位/ 14位/ 16位, 100ksps的的SoftSpan A / D转换器,带有关断 [8-Channel, 12-/14-/16-Bit, 100ksps SoftSpan A/D Converters with Shutdown]
分类和应用: 转换器
文件页数/大小: 20 页 / 261 K
品牌: LINEAR [ LINEAR INTEGRATED SYSTEMS ]
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LTC1857/LTC1858/LTC1859
8-Channel, 12-/14-/16-Bit,
100ksps SoftSpan A/D Converters
with Shutdown
FEATURES
DESCRIPTIO
Sample Rate: 100ksps
8-Channel Multiplexer with
±25V
Protection
Single 5V Supply
Software-Programmable Input Ranges:
0V to 5V, 0V to 10V,
±5V
or
±10V
Single Ended or Differential
±3LSB
INL for the LTC1859,
±1.5LSB
INL for the
LTC1858,
±1LSB
INL for the LTC1857
Power Dissipation: 40mW (Typ)
SPI/MICROWIRE
TM
Compatible Serial I/O
Power Shutdown: Nap and Sleep
Signal-to-Noise Ratio: 87dB (Typ) for the LTC1859
Operates with Internal or External Reference
Internal Synchronized Clock
28-Pin SSOP Package
The LTC
®
1857/LTC1858/LTC1859 are 8-channel, low
power, 12-/14-/16-bit, 100ksps, analog-to-digital con-
verters (ADCs). These SoftSpan
TM
ADCs can be software-
programmed for 0V to 5V, 0V to 10V,
±5V
or
±10V
input
spans and operate from a single 5V supply. The 8-chan-
nel multiplexer can be programmed for single-ended
inputs or pairs of differential inputs or combinations of
both. In addition, all channels are fault protected to
±25V.
A fault condition on any channel will not affect the
conversion result of the selected channel.
An onboard high performance sample-and-hold and pre-
cision reference minimize external components. The low
40mW power dissipation is made even more attractive
with two user selectable power shutdown modes. DC speci-
fications include
±3LSB
INL for the LTC1859,
±1.5LSB
INL for the LTC1858 and
±1LSB
for the LTC1857.
The internal clock is trimmed for 5µs maximum conver-
sion time and the sampling rate is guaranteed at 100ksps.
A separate convert start input and data ready signal (BUSY)
ease connections to FIFOs, DSPs and microprocessors.
, LTC and LT are registered trademarks of Linear Technology Corporation.
SoftSpan is a trademark of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
APPLICATIO S
Industrial Process Control
Multiplexed Data Acquisition Systems
High Speed Data Acquisition for PCs
Digital Signal Processing
TYPICAL APPLICATIO
100kHz, 12-Bit/14-Bit/16-Bit Sampling ADC
CONVST
COM
CH0 LTC1857/ RD
CH1 LTC1858/ SCK
CH2 LTC1859 SDI
DGND
CH3
SDO
CH4
BUSY
CH5
OV
DD
CH6
DV
DD
CH7
+
AV
DD
MUXOUT
MUXOUT
AGND3
ADC
+
AGND2
ADC
REFCOMP
AGND1
V
REF
2.0
1.5
SOFTWARE-PROGRAMMABLE
SINGLE-ENDED OR
DIFFERENTIAL INPUTS
(0V TO 5V, 0V TO 10V,
±5V
OR
±10V)
µP
CONTROL
LINES
INL (LSB)
10µF
10µF
3V TO 5V
5V
5V
10µF
2.5V
1µF
10µF
U
LTC1859 Typical INL Curve
1.0
0.5
0
– 0.5
–1.0
–1.5
–2.0
–32768
–16384
0
CODE
16384
32767
1859 TA02
U
U
185789f
1