MAX1478
1%-Accurate, Digitally Trimmed, Rail-to-Rail Sensor Signal Conditioner
Part Details
- Medium Accuracy (±1%), Single-Chip Sensor Signal Conditioning
- Rail-to-Rail® Output
- Sensor Errors Trimmed Using Correction Coefficients Stored in Internal EEPROM-Eliminates Laser Trimming and Potentiometers
- Compensates Offset, Offset TC, FSO, FSO TC, and FSO Linearity
- Programmable Current Source (0.1mA to 2.0mA) for Sensor Excitation
- Fast Signal-Path Settling Time (<1ms)
- +5V Single Supply
- Accepts Sensor Outputs from +10mV/V to +40mV/V
- Fully Analog Signal Path
The MAX1478 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 digital-to-analog converters (DACs). Achieving a total error factor within 1% of the sensor's repeatability errors, the MAX1478 compensates offset, offset temperature coefficient, full-span output (FSO), FSO temperature coefficient (FSO TC), and FSO nonlinearity of silicon piezoresistive sensors.
The MAX1478 calibrates and compensates first-order temperature errors by adjusting the offset and span of the input signal via DACs, thereby eliminating the quantization noise associated with digital signal path solutions. Built-in testability features on the MAX1478 result in the integration of three traditional sensor-manufacturing operations into one automated process:
Although optimized for use with piezoresistive sensors, the MAX1478 may also be used with other resistive sensors (i.e., accelerometers and strain gauges) with some additional external components.
Applications
- Automotive Electronics
- Hydraulic Systems
- Industrial Pressure Sensors
- Industrial Temperature Sensors
- Manifold Absolute Pressure (MAP) Sensors
- Piezoresistive Pressure and Acceleration
- Strain-Gauge Sensors
- Transducers and Transmitters
Documentation
Data Sheet 1
Application Note 1
Technical Articles 1
This is the most up-to-date revision of the Data Sheet.
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