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LTC1291DMJ8 Datasheet

  • LTC1291DMJ8

  • Single Chip 12-Bit Data Acquisition System

  • 20頁

  • LINER

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LTC1291
Single Chip 12-Bit
Data Acquisition System
FEATURES
s
s
s
s
DESCRIPTIO
s
s
s
Built-In Sample-and-Hold
Single Supply 5V Operation
Power Shutdown
Direct 3- or 4-Wire Interface to Most MPU Serial
Ports and All MPU Parallel Ports
Two-Channel Analog Multiplexer
Analog Inputs Common Mode to Supply Rails
8-Pin DIP Package
KEY SPECIFICATIO S
s
s
s
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 鈥?鈥?/div>
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 (V
CC
). 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
Resolution: 12 Bits
Fast Conversion Time: 12碌s Max Over Temp.
Low Supply Current:
6.0mA (Typ) Active Mode
10碌A (Max) Shutdown Mode
TYPICAL APPLICATI
2-Channel 12-Bit Data Acquisition System
22碌F
TANTALUM
+5V
0.5
0.4
0.3
CS
CH0
2-CHANNEL
MUX*
CH1
GND
DELTA (LSB)
V
CC
(V
REF
)
0.1碌F
CLK
LTC1291
D
OUT
D
IN
DO
SCK
MC68HC11
MISO
MOSI
1291 TA01
*FOR OVERVOLTAGE PROTECTION LIMIT THE INPUT CURRENT TO 15mA
PER PIN OR CLAMP THE INPUTS TO V
CC
AND GND WITH 1N4148 DIODES.
CONVERSION RESULTS ARE NOT VALID WHEN THE SELECTED CHANNEL OR
THE OTHER CHANNEL IS OVERVOLTAGED (V
IN
< GND OR V
IN
> V
CC
). SEE
SECTION ON OVERVOLTAGE PROTECTION IN THE APPLICATIONS INFORMATION.
U
Channel-to-Channel
INL Matching
0.2
0.1
0
鈥?.1
鈥?.2
鈥?.3
鈥?.4
鈥?.5
0
512 1024 1536 2048 2560 3072 3584 4096
CODE
1291 TA02
UO
U
+
1

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