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MAX1450
Low-Cost, 1%-Accurate Signal Conditioner for Piezoresistive Sensors

Digitally Compensates Sensors to 1% Accuracy


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Description
FULL DATA SHEET (PDF, 552kB)
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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.

Key Features   Applications/Uses
  • 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

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

    Key Specifications:   Sensor Signal Conditioners
    Part Number PGA Calibration Method Accuracy (% FSO) Output Type Typ/Max Supply Current (mA) Sensor Excitation Current Source (mA) Features Supply Voltage (V) Package Operating Temp. Range (°C) Price*
    MAX1450  3-bit Laser trimmed resistors/trim pots 1 Analog 2.8/3.5 0.1 to 2.0
    Low Cost
    4.5 to 5.5 DICE SALES/0
    SSOP/20
    -40 to +125
    -40 to +85
    0 to +70
    $1.98 @ 1k
    See All Sensor Signal Conditioners (4)
    Notes:
    *This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

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    Document Ref.: 19-1365; Rev 1; 2005-09-08
    This page last modified: 2007-06-01




             



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