1%-Accurate, Digitally Trimmed, Rail-to-Rail Sensor Signal Conditioner

Please check latest availability status for a specific part variant.


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:

  • 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 MAX1478.
  • Final test operation: Verification of transducer calibration and compensation without removal from the pretest socket.

  • 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.

    Key Features

    • 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


    • 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
    Request Reliability Report for: MAX1478 
    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.

    Quality Management System >
    Environmental Management System >


    Related Resources

    Complete Optical Biosensing Module with Ultra-Low-Power Biometric Sensor Hub

    • Complete Biometric Sensor Hub
    • World-Class Algorithm for Wearable Applications

    ±0.25°C Accurate I2C Temperature Sensor

    • High Accuracy
    • Long Battery Life
    • Small Size

    1-Wire® Temperature Sensor with ±1ºC Accuracy

    • 1-Wire Interface Requires Only One Port Pin for Communication
    • Unique 64-bit Serial Code Stored in an On-Board ROM
    • External Resistor Selects Address for Location Identification

    Integrated Optical Sensor Module for Mobile Health

    • Miniature 3.5mm x 7.0mm x 1.5mm, 14-Pin Optical Module
    • Optical-Grade Glass for Long-Term Optimal and Robust Performance
    • Ultra-Low-Power Operation for Mobile Device

    Gesture Sensor for Automotive Applications

    • Low-Cost, Flexible Gesture-Sensing Solution for Automotive Applications
    • Low-Power, Low-Cost External CPU Processes Sensor Output
    • Supports Swipe, Rotation, and Proximity Gestures

    Best-in-Class Optical Pulse Oximeter and Heart-Rate Sensor AFE for Wearable Health

    • Complete Single-Channel Optical Data Acquisition System
    • Ultra Low-Power Operation for Wearable Devices
    • Excellent Top-End Dynamic Range > 91dB in White Card Loop-Back Test (Nyquist Sample-to-Sample Variance)

    MAXREFDES103#: Health Sensor Band