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AD22151 Datasheet(PDF) 1 Page - Analog Devices |
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AD22151 Datasheet(HTML) 1 Page - Analog Devices |
1 / 8 page REV. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective companies. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved. AD22151 Linear Output Magnetic Field Sensor FEATURES Adjustable Offset to Unipolar or Bipolar Operation Low Offset Drift over Temperature Range Gain Adjustable over Wide Range Low Gain Drift over Temperature Range Adjustable First Order Temperature Compensation Ratiometric to VCC APPLICATIONS Automotive Throttle Position Sensing Pedal Position Sensing Suspension Position Sensing Valve Position Sensing Industrial Absolute Position Sensing Proximity Sensing FUNCTIONAL BLOCK DIAGRAM TEMP REF ISOURCE DEMOD SWITCHES OUT AMP REF VCC/2 AD22151 GENERAL DESCRIPTION The AD22151 is a linear magnetic field transducer. The sensor output is a voltage proportional to a magnetic field applied perpendicularly to the package top surface. The sensor combines integrated bulk Hall cell technology and instrumentation circuitry to minimize temperature related drifts associated with silicon Hall cell characteristics. The architecture maximizes the advantages of a monolithic implementation while allowing sufficient versatility to meet varied application require- ments with a minimum number of components. Principal features include dynamic offset drift cancellation and a built-in temperature sensor. Designed for single 5 V supply operation, the AD22151 achieves low drift offset and gain operation over –40 ∞C to +150∞C. Temperature compensa- tion can accommodate a number of magnetic materials commonly utilized in economic position sensor assemblies. The transducer can be configured for specific signal gains to meet various application requirements. Output voltage can be adjusted from fully bipolar (reversible) field operation to fully unipolar field sensing. The voltage output achieves near rail-to-rail dynamic range, capable of supplying 1 mA into large capacitive loads. The signal is ratiometric to the positive supply rail in all configurations. NC R1 GND R3 R2 VCC AD22151 NC = NO CONNECT OUTPUT 0.1 F Figure 1. Typical Bipolar Configuration with Low (< –500 ppm) Compensation NC R1 GND R3 R2 VCC AD22151 NC = NO CONNECT OUTPUT 0.1 F R4 Figure 2. Typical Unipolar Configuration with High ( –2000 ppm) Compensation |
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