LTC1287 Datasheet | Linear Technology

3V Single Chip 12-Bit Data Acquisition System Features s Single Supply 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 30k Hz Maximum Throughput Rate U KEY SPECIFICATIO S s Minimum Guaranteed Supply Voltage: 2.7V s Resolution: 12 Bits s Fast Conversion Time: 24µs Max Over Temp. s Low Supply Current: 1.0m A U APPLICATIO S s Battery-Powered Instruments s Data Logger s Data Acquisition Modules DESCRIPTIO The LTC®1287 is a 3V data acquisition ponent which contains a serial I/O successive approximation A/D converter. The device specifications are guaranteed at a supply voltage of 2.7V. It uses LTCMOSTM switched capacitor technology to perform a 12-bit unipolar, A/D conversion. The differential input has an on-chip sampleand-hold on the (+) input. The serial I/O is designed to municate 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. , LTC and LT are registered trademarks of Linear Technology Corporation. LTCMOS is a trademark of Linear Technology Corporation TYPICAL APPLICATIO 3V Differential Input Data Acquisition System 22µF TANTALUM + DIFFERENTIAL INPUTS + MON MODE RANGE 0V TO VCC- - CS VCC +IN CLK LTC1287 - IN DOUT GND VREF + 22µF TANTALUM 3V 10k LITHIUM LT1004-1.2 TO AND FROM MPU - FOR OVERVOLTAGE PROTECTION, LIMIT THE INPUT CURRENT TO 15m A 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. 1287...