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LTC1287BCN Datasheet

  • LTC1287BCN

  • 3V Single Chip 12-Bit Data Acquisition System

  • 328.04KB

  • 16頁

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LTC1287
3V Single Chip 12-Bit
Data Acquisition System
FEATURES
s
s
s
DESCRIPTIO
s
Single Supply 3.3V or
鹵3.3V
Operation
Built-In Sample-and-Hold
Direct 3-Wire Interface to Most MPU Serial Ports and
All MPU Parallel Ports
30kHz Maximum Throughput Rate
KEY SPECIFICATIO S
s
s
s
s
The LTC1287 is a 3V data acquisition component which
contains a serial I/O successive approximation A/D con-
verter. The device specifications are guaranteed at a
supply voltage of 2.7V. It uses LTCMOS
TM
switched ca-
pacitor technology to perform a 12-bit unipolar, A/D
conversion. The differential input has an on-chip sample-
and-hold on the (+) input.
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 and received over
three wires. The low voltage operating capability and the
low power consumption of this device make it ideally
suited for battery applications. Given the ease of use, small
package size and the minimum number of interconnects
for I/O, the LTC1287 can be used for remote sensing
applications.
LTCMOS is a trademark of Linear Technology Corporation
Minimum Guaranteed Supply Voltage: 2.7V
Resolution: 12 Bits
Fast Conversion Time: 24碌s Max Over Temp.
Low Supply Current: 1.0mA
TYPICAL APPLICATI
s
s
s
Battery-Powered Instruments
Data Logger
Data Acquisition Modules
3V Differential Input Data Acquisition System
22碌F TANTALUM
+
1.0
CS
DIFFERENTIAL INPUTS
COMMON MODE RANGE
0V TO V
CC
*
V
CC
10k
+IN
LTC1287
鈥揑N
GND
CLK
D
OUT
V
REF
22碌F
TANTALUM
ERROR (LSB)
0
+
鈥?/div>
3V
LITHIUM
0.5
+
LT1004-1.2
鈥?.5
鈥?.0
0
TO AND FROM MPU
* 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
OTHER CHANNEL IS OVERVOLTAGED (V
IN
< GND OR V
IN
> V
CC
). SEE SECTION
ON OVERVOLTAGE PROTECTION IN THE APPLICATIONS INFORMATION.
512
1024
1536
2048
CODE
LTC1287 TA02
1287 TA01
U
INL with V
REF
= 1.2V
2560
3072
3584
4096
UO
U
1

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