MAX1450

Low-Cost, 1%-Accurate Signal Conditioner for Piezoresistive Sensors

Digitally Compensates Sensors to 1% Accuracy


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Description

The MAX1450 sensor signal conditioner is optimized for piezoresistive sensor calibration and temperature compensation. It includes an adjustable current source for sensor excitation and a 3-bit programmable-gain amplifier (PGA). Achieving a total typical error factor within 1% of the sensor's inherent repeatability errors, the MAX1450 compensates offset, full-span output (FSO), offset tempco, FSO tempco, and FSO nonlinearity of silicon piezoresistive sensors via external trimmable resistors, potentiometers, or digital-to-analog converters (DACs).

The MAX1450 is capable of compensating sensors that display close error distributions with a single temperature point, making it ideal for low-cost, medium-accuracy applications. Although optimized for use with popular piezoresistive sensors, it may also be used with other resistive sensor types such as strain gauges.
MAX1450: Functional Diagram MAX1450: Functional Diagram Enlarge+

Key Features

  • 1% Sensor Signal Conditioning
  • Corrects Sensor Errors Using Coefficients Stored in External Trimmable Resistors, Potentiometers, or DACs
  • Compensates Offset, Offset TC, FSO, FSO TC, and FSO Linearity
  • Rail-to-Rail Analog Output
  • Programmable Current Source for Sensor Excitation
  • Fast Signal-Path Settling Time (< 1ms)
  • Accepts Sensor Outputs from 10mV/V to 30mV/V
  • Fully Analog Signal Path
  • Contains PGA, current source

Applications/Uses

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

MAX1450EVKIT: Evaluation Kit for the MAX1450
Request Reliability Report for: MAX1450 
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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