Re: Crystals with slightly difference specs with the microcontroller?
- From: "Dan H" <dan.hollands@xxxxxxxxx>
- Date: 21 Feb 2006 12:12:59 -0800
Ant_Magma wrote:
Hi, i'm currently trying to build an ethernet interface for my project.
I'm using a National Semiconductor DP83847 ethernet transceiver. The
data*** 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?
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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