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MAX1457

Maxim
Part Number MAX1457
Manufacturer Maxim
Description 0.1%-Accurate Signal Conditioner for Piezoresistive Sensor Compensation
Published May 6, 2005
Detailed Description 19-1342; Rev 1; 8/98 KIT ATION EVALU E L B A IL AVA 0.1%-Accurate Signal Conditioner for Piezoresistive Sensor Compens...
Datasheet PDF File MAX1457 PDF File

MAX1457
MAX1457

Overview
19-1342; Rev 1; 8/98 KIT ATION EVALU E L B A IL AVA 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 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.
The serial interface is compatible with MicroWire™ and SPI™, and directly connects to an external EEPROM.
Additionally, built-in testability features of the MAX1457 facilitate manufacturing and calibration of multiple sensor modules, thus l...


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