General Description
The MAX1459 highly integrated analog-sensor signal conditioner is optimized for piezoresistive sensor calibration and compensation with minimal 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 MAX1459 compensates offset, offset temperature coefficient (offset TC), full-span output (FSO), FSO temperature coefficient (FSOTC), and FSO nonlinearity of silicon piezoresistive sensors.

FEATUREs
♦ Highly Integrated Sensor Signal Conditioner for 2-Wire, 4–20mA Transmitters
♦ 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 +1mV/V to +40mV/V
♦ Fully Analog Signal Path
♦ Internal or External Temperature Reference Compensation
♦ Automated Pilot Production (Calibration/Compensation) System Available
♦ Write Protection for EEPROM Data Security

APPLICATIONs
  4–20mA Transmitters
  Piezoresistive Pressure and Acceleration
  Industrial Pressure Sensors
  Load Cells/Wheatstone Bridges
  Strain Gauges
  Temperature Sensors