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General Description

The MAX1457 is a highly integrated analog-sensor signal processor optimized for piezoresistive sensor calibration and compensation. It includes a programmable current source for sensor excitation, a 3-bit programmable-gain amplifier (PGA), a 12-bit ADC, five 16-bit DACs, and an uncommitted op amp. Achieving a total error factor within 0.1 of the sensor’s repeatability errors, the MAX1457 compensates offset, full-span output (FSO), offset TC, FSO TC, and full-span output nonlinearity of silicon piezoresistive sensors.

Features

? High Accuracy (within ±0.1 of sensor’s repeatable errors)

? Compensates Offset, Offset TC, FSO, FSO TC, Temperature/Pressure Nonlinearity

? Rail-to-Rail? Analog Output for Calibrated, Temperature-Compensated Pressure Measurements

? Programmable Sensor Excitation Current

? SPI/MicroWire-Compatible Serial Interface

? Fast Signal-Path Settling Time (<1ms)

? Accepts Sensor Outputs from 5mV/V to 30mV/V

? Pin-Compatible with MCA7707