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LTC1287 Datasheet(PDF) 1 Page - Linear Technology

Part No. LTC1287
Description  3V Single Chip 12-Bit Data Acquisition System
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC1287
1
3V Single Chip 12-Bit
Data Acquisition System
s
Single Supply 3.3V or
±3.3V Operation
s
Built-In Sample-and-Hold
s
Direct 3-Wire Interface to Most MPU Serial Ports and
All MPU Parallel Ports
s
30kHz Maximum Throughput Rate
S
FEATURE
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.
KEY SPECIFICATIO S
s
Minimum Guaranteed Supply Voltage: 2.7V
s
Resolution: 12 Bits
s
Fast Conversion Time: 24
µs Max Over Temp.
s
Low Supply Current: 1.0mA
APPLICATI
TYPICAL
s
Battery-Powered Instruments
s
Data Logger
s
Data Acquisition Modules
LTCMOS is a trademark of Linear Technology Corporation
DESCRIPTIO
VCC
CLK
DOUT
VREF
LTC1287
CS
+IN
–IN
GND
+
LT1004-1.2
10k
22
µF TANTALUM
22
µF
TANTALUM
+
–
DIFFERENTIAL INPUTS
COMMON MODE RANGE
0V TO VCC*
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
OTHER CHANNEL IS OVERVOLTAGED (VIN < GND OR VIN > VCC). SEE SECTION
ON OVERVOLTAGE PROTECTION IN THE APPLICATIONS INFORMATION.
*
3V
LITHIUM
TO AND FROM MPU
1287 TA01
3V Differential Input Data Acquisition System
INL with VREF = 1.2V
CODE
0
0.5
1.0
2048
LTC1287 TA02
0
–1.0
512
1024
1536
–0.5
2560
3072
3584
4096




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