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LTC1856_15

Description
8-Channel, 10V Input 12-/14-/16-Bit, 100ksps ADC Converters with Shutdown
File Size626KB,24 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC1856_15 Overview

8-Channel, 10V Input 12-/14-/16-Bit, 100ksps ADC Converters with Shutdown

FeaTures
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LTC1854/LTC1855/LTC1856
8-Channel,
±10V
Input
12-/14-/16-Bit, 100ksps ADC
Converters with Shutdown
DescripTion
The LTC
®
1854/LTC1855/LTC1856 are 8-channel, low
power, 12-/14-/16-bit, 100ksps, analog-to-digital con-
verters (ADCs). These ADCs operate from a single 5V
supply and the 8-channel multiplexer can be programmed
for single-ended inputs, pairs of differential inputs, or
combinations of both. In addition, all channels are fault
protected to ±30V. A fault condition on any channel will not
affect the conversion result of the selected channel.
An onboard precision reference minimizes external com-
ponents. Power dissipation is 40mW at 100ksps and lower
in two power shutdown modes (27.5mW in Nap mode and
40µW in Sleep mode.) DC specifications include ±3LSB
INL for the LTC1856, ±1.5LSB INL for the LTC1855 and
±1LSB for the LTC1854.
The internal clock is trimmed for 5µs maximum conversion
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.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
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Single 5V Supply
Sample Rate: 100ksps
8-Channel Multiplexer with ±30V Protection
±10V Bipolar Input Range
Single Ended or Differential
±3LSB INL for the LTC1856, ±1.5LSB INL for the
LTC1855, ±1LSB INL for the LTC1854
Power Dissipation: 40mW (Typ)
SPI/MICROWIRE™ Compatible Serial I/O
Power Shutdown: Nap and Sleep
SINAD: 87dB (LTC1856)
Operates with Internal or External Reference
Internal Synchronized Clock
28-Pin SSOP Package
applicaTions
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Industrial Process Control
Multiplexed Data Acquisition Systems
High Speed Data Acquisition for PCs
Digital Signal Processing
Typical applicaTion
100kHz, 12-Bit/14-/16-Bit Sampling ADC
COM
CONVST
CH0 LTC1854/
RD
CH1 LTC1855/ SCK
CH2 LTC1856 SDI
CH3
DGND
CH4
SDO
CH5
BUSY
CH6
OV
DD
DV
DD
CH7
AV
DD
MUXOUT
+
MUXOUT
AGND3
ADC
+
AGND2
ADC
REFCOMP
AGND1
V
REF
2.0
1.5
µP
CONTROL
LINES
INL (LSB)
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–32768
–16384
0
CODE
16384
32767
185456 G01
LTC1856 Typical INL Curve
SOFTWARE-PROGRAMMABLE
SINGLE-ENDED OR
DIFFERENTIAL INPUTS
±10V BIPOLAR INPUT RANGE
0.1µF
10µF
10µF
0.1µF
10µF
3V TO 5V
5V
5V
0.1µF
2.5V
1µF
10µF
0.1µF
1854565af
1

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LTC1856_15 LTC1854_15 LTC1855_15
Description 8-Channel, 10V Input 12-/14-/16-Bit, 100ksps ADC Converters with Shutdown 8-Channel, 10V Input 12-/14-/16-Bit, 100ksps ADC Converters with Shutdown 8-Channel, 10V Input 12-/14-/16-Bit, 100ksps ADC Converters with Shutdown
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