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    Sensors Track Speed

    July 22, 2004
    The A1425 analag speed sensor has a built-in integrated tracking capacitor and dual zero-crossing output signal.

    SENSORS TRACK SPEED

    The output switches precisely when the difference in magnetic field strength between the two Hall-effect elements is zero. Coupled with a back-biasing magnet, the sensor can turn on or off with the leading or trailing edge of a gear tooth or slot. Differential sensing provides immunity to radial vibration and an on-chip bandpass filter eliminates system offsets. Applications include speed sensing in automotive crankshafts using ring magnets.

    Allegro Microsystems,
    115 Northeast Cutoff, Worcester, MA 01606,
    (508) 853-5000,
    www. allegromicro.com

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