MAX1458

© 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

Piezoresistive Pressure and Acceleration
Transducers and Transmitters
MAP (Manifold Absolute Pressure) Sensors
Automotive Systems
Hydraulic Systems
Industrial Pressure Sensors

Supply Voltage, VDD to VSS......................................-0.3V to +6V
All Other Pins ...................................(VSS - 0.3V) to (VDD + 0.3V)
Short-Circuit Duration, FSOTC, OUT, BDRIVE ...........Continuous
Continuous Power Dissipation (TA = +70°C)
     SSOP (derate 8.00mW/°C above +70°C) ..................640mW
Operating Temperature Ranges
     MAX1458CAE ...................................................0°C to +70°C
     MAX1458AAE ..............................................-40°C to +125°C
Storage Temperature Range ...........................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C

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.

The MAX1458 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. Built-in testability features on the MAX1458 result in the integration of three traditional sensor-manufacturing 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 internal EEPROM) of calibration and compensation coefficients computed by the test computer and downloaded to the MAX1458.
` Final test operation: Verification of transducer calibration and compensation without removal from the pretest socket.

Although optimized for use with piezoresistive sensors, the MAX1458 may also be used with other resistive sensors (i.e., accelerometers and strain gauges) with some additional external components.