General Description

The MAX1458 highly integrated analog-sensor signal processor is optimized for piezoresistive sensor calibration and compensation without any external components. It includes a programmable current source for sensor excitation, a 3-bit programmable-gain amplifier (PGA), a 128- bit internal EEPROM, and four 12-bit DACs. Achieving a total error factor within 1% of the sensor’s repeatability errors, the MAX1458 compensates offset, offset temperature coefficient, full-span output (FSO), FSO temperature coefficient (FSOTC), and FSO nonlinearity of silicon piezoresistive sensors.

Features

● Medium Accuracy (±1%), Single-Chip Sensor Signal Conditioning

● Sensor Errors Trimmed Using Correction Coefficients Stored in Internal EEPROM—Eliminates the Need for Laser Trimming and Potentiometers

● Compensates Offset, Offset-TC, FSO, FSOTC, FSO Linearity

● Programmable Current Source (0.1mA to 2.0mA) for Sensor Excitation

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

● Accepts Sensor Outputs from 10mV/V to 40mV/V

● Fully Analog Signal Path

Applications

● Piezoresistive Pressure and Acceleration

● Transducers and Transmitters

● MAP (Manifold Absolute Pressure) Sensors

● Hydraulic Systems

● Industrial Pressure Sensors