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Crystals with slightly difference specs with the microcontroller?

Discussion in 'Electronic Basics' started by Ant_Magma, Feb 21, 2006.

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  1. Ant_Magma

    Ant_Magma Guest

    Hi, i'm currently trying to build an ethernet interface for my project.

    I'm using a National Semiconductor DP83847 ethernet transceiver. The
    datasheet stated that it requires a 25Mhz 0.005% 50PPM oscillator.

    My question is, lets say i can't find an exact match for the crystal,
    such as:
    1) Slightly lower/ higher frequency
    2) Different accuracy, lets say 100PPM

    What will be the effect for both cases?
     
  2. Dan H

    Dan H Guest

    It is almost certain that the initial accuracy 25MHz 0.005% is
    necessary

    The 50ppm is the drift - probably with temperature e.g. per 1degree C.
    you might get away with 100 ppm if you are in a controlled temperature
    environment.

    Dan H
     
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