MAX1458

1% Accurate, Digitally Trimmed Sensor Signal Conditioner

Industry's Smallest Pressure Sensor Signal Conditioner


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Description

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.
  • MAX1458: Functional Diagram MAX1458: Functional Diagram Enlarge+

    Key Features

    • 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

    Applications/Uses

    • Hydraulic Systems
    • Manifold Absolute Pressure (MAP) Sensors
    • Piezoresistive Pressure and Acceleration
    • Transducers and Transmitters
    Request Reliability Report for: MAX1458 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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