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LTC1291DCN8 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC1291DCN8
Description  Single Chip 12-Bit Data Acquisition System
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1291DCN8 Datasheet(HTML) 1 Page - Linear Technology

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1
LTC1291
The LTC1291 is a data acquisition system that contains a
serial I/O successive approximation A/D converter. It uses
LTCMOS
TM switched capacitor technology to perform a
12-bit unipolar A/D conversion. The input multiplexer can
be configured for either single-ended or differential in-
puts. An on-chip sample-and-hold is included on the “+”
input. When the LTC1291 is idle, it can be powered down
in applications where low power consumption is desired.
An external reference is not required because the LTC1291
takes its reference from the power supply (VCC). All these
features are packaged in an 8-pin DIP.
The serial I/O is designed to communicate without external
hardware to most MPU serial ports and all MPU parallel
I/O ports allowing data to be transmitted over three or four
wires. Given the accuracy, ease of use and small package
size, this device is well suited for digitizing analog signals
in remote applications where minimum number of inter-
connects, small physical size, and low power consump-
tion are important.
LTCMOS
TM is a trademark of Linear Technology Corporation
Single Chip 12-Bit
Data Acquisition System
S
FEATURE
DESCRIPTIO
s
Built-In Sample-and-Hold
s
Single Supply 5V Operation
s
Power Shutdown
s
Direct 3- or 4-Wire Interface to Most MPU Serial
Ports and All MPU Parallel Ports
s
Two-Channel Analog Multiplexer
s
Analog Inputs Common Mode to Supply Rails
s
8-Pin DIP Package
s
Resolution: 12 Bits
s
Fast Conversion Time: 12
µs Max Over Temp.
s
Low Supply Current:
6.0mA (Typ) Active Mode
10
µA (Max) Shutdown Mode
KEY SPECIFICATIO S
+5V
CH0
GND
DIN
DOUT
CLK
VCC(VREF)
CS
LTC1291
2-CHANNEL
MUX*
CH1
0.1µF
22µF
TANTALUM
*FOR OVERVOLTAGE PROTECTION LIMIT THE INPUT CURRENT TO 15mA
PER PIN OR CLAMP THE INPUTS TO VCC AND GND WITH 1N4148 DIODES.
CONVERSION RESULTS ARE NOT VALID WHEN THE SELECTED CHANNEL OR
THE OTHER CHANNEL IS OVERVOLTAGED (VIN < GND OR VIN > VCC). SEE
SECTION ON OVERVOLTAGE PROTECTION IN THE APPLICATIONS INFORMATION.
1291 TA01
DO
MC68HC11
SCK
MISO
MOSI
2-Channel 12-Bit Data Acquisition System
APPLICATI
TYPICAL
CODE
0
–0.5
–0.4
–0.2
–0.1
0
0.5
0.2
1024
2048 2560
1291 TA02
–0.3
0.3
0.4
0.1
512
1536
3072 3584 4096
Channel-to-Channel
INL Matching


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