LINEAR LTC1292 1297 User's Manual
Summary
Experience high-precision analog signal conversion with the 12-bit LTC1292/LTC1297 Data Acquisition System. Featuring built-in sample-and-hold, differential inputs, and efficient serial I/O, these systems provide reliable digitization optimized for low power consumption (down to 5μA) a crucial benefit for remote applications. This solution is ideal for engineers designing complex sensing equipment that requires high accuracy, minimal interconnects, and robust performance in limited operating environments.
Page 1 Text Content
LTC1292/LTC1297 Single Chip 12-Bit Data Acquisition Systems
SFEATURE ESCRIPTIO Built-In Sample-and-Hold The LTC1292/LTC1297 are data acquisition systems that Single Supply 5V Operation contain a 12-bit, switched-capacitor successive approxi- 60k Hz Maximum Throughput Rate (LTC1292) mation A/D, a differential input, sample-and-hold on the Power Shutdown After Each Conversion (LTC1297) (+) input, and serial I/O. When the LTC1297 is idle between Direct 3-Wire Interface to Most MPU Serial Ports and conversions it automatically powers down reducing the All MPU Parallel Ports supply current to 5µA, typically. The LTC1292 is capable Analog Inputs Common Mode to Supply Rails of digitizing signals at a 60k Hz rate and with the device’s excellent AC characteristics, it can be used for DSP appli- cations. All these features are packaged in an 8-pin DIP KEY SPECIFICATIO S and are made possible using LTCMOSTM switched-capaci- tor technology.
Resolution: 12 Bits Fast Conversion Time: 12µs Max Over Temp The serial I/O is designed to communicate without external Low Supply Current: 6.0m A hardware to most MPU serial ports and all MPU parallel Shutdown Supply Current: 5µA (LTC1297) I/O ports allowing data to be transmitted over three wires.
Because of their accuracy, ease of use and small package size these devices are well suited for digitizing analog
AV ER AG (µ A) signals in remote applications where minimum number of
interconnects and power consumption are important. LTCMOS is trademark of Linear Technology Corporation
PPLICATITYPICAL
Power Supply Current
12-Bit Differential Input Data Acquisition System vs Sampling Frequency
CS VCC 5V DO
MC68HC11
TANTALUM
DIFFERENTIAL
+IN CLK SCK
INPUTS
COMMON MODE LTC1297 1N4148
RANGE –IN DOUT MISO 0V TO 5V*
GND VREF LT1027 8V TO 40V
4.7µF 1µF TANTALUM
f SAMPLE (Hz)
*FOR OVERVOLTAGE PROTECTION LIMIT THE INPUT CURRENT TO 15m A LTC1297• TA02
PER PIN OR CLAMP THE INPUTS TO VCC AND GND WITH 1N4148 DIODES. CONVERSION RESULTS ARE NOT VALID WHEN ANY INPUT IS OVERVOLTAGED (VIN < GND OR VIN > VCC). SEE SECTION ON OVERVOLTAGE PROTECTION IN LTC1292/7 TA01 THE APPLICATIONS INFORMATION.
Page Summary Contents For LINEAR LTC1292 1297 User's Manual
Manual Details
| Brand | Linear |
|---|---|
| Pages | 24 |
| File Size | 827.32 KB |
| Published | May 25, 2026 |
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Frequently Asked Questions
What is the maximum sampling rate for the LTC1292?
The LTC1292 is capable of digitizing signals at a 60kHz rate.
How does the LTC1297 conserve power when it's idle?
When idle between conversions, the LTC1297 automatically powers down and reduces supply current to typically 5μA.
What key safety limitation should I be aware of during data conversion?
Conversion results are not valid if any input is overvoltagged (i.e., V < GND or V > V).
What type of interfacing options does the device provide for microcontrollers?
The serial I/O offers a Direct 3-Wire Interface to most MPU serial and parallel ports.