器件名称:
MAX145
功能描述:
0.1%-Accurate Signal Conditioner for Piezoresistive Sensor Compensation
文件大小:
93.35KB 共12页
简 介:
19-1342; Rev 1; 8/98 KIT ATION EVALU E L B AVAILA 0.1%-Accurate Signal Conditioner for Piezoresistive Sensor Compensation ________________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. 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. 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 f……
