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LTC1287BI Datasheet(PDF) 1 Page - Linear Technology |
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LTC1287BI Datasheet(HTML) 1 Page - Linear Technology |
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1 / 16 page  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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