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 100PPMWhat will be the effect for both cases?
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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