Crystals with slightly difference specs with the microcontroller?

Feb 21, 2006 1 Replies

Rate this thread:

Ant_Magma 20 years ago

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?

Vote

Dan H 20 years ago

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

Vote

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required