Maxim Integrated MAX1457
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. The MAX1457 calibrates and compensates first-order temperature errors by adjusting the offset and span of the input signal via digital-to-analog converters (DACs), thereby eliminating quantization noise.| Part No. | MAX1457 |
|---|---|
| Datasheet | MAX1457 Download |
| Manufacturer |  Maxim Integrated |
| Description | 0.1%-Accurate Signal Conditioner for Piezoresistive Sensor Compensation |
| Buy | Stock & Price |
DESCRIPTION
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. If needed, residual higher-order errors are then compensated using linear interpolation of the first-order coefficients stored in a look-up table (in external EEPROM). The MAX1457 integrates three traditional sensormanufacturing operations into one automated process:● Pretest: Data acquisition of sensor performance under the control of a host test computer.
● Calibration and Compensation: Computation and storage (in an external EEPROM) of calibration and compensation coefficients determined from transducer pretest data.
● Final Test: Verification of transducer calibration and compensation, without removal from a pretest socket. Analog outputs are provided for both pressure and temperature. A general-purpose, uncommitted op amp is also included on-chip to increase the overall circuit gain, or to facilitate the implementation of a 2-wire, 4–20mA transmitter.
