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DP83822I: MEMs oscillator as clock source

reto hermann
Intellectual 720 points
Part Number: DP83822I

Dear all,

on a custom board we are using a MEMs oscillator (SIT1602) as clock source for the DP83822I Ethernet PHY. So far we have not noticed any issues with that setup. However I was told that crystal oscillators are the better choice as clock source for an Ethernet PHY because MEMs oscillators can cause issues like e.g. Ethernet packet losts. Can you confirm that? Do you have any concerns with the setup that we are using?

Thank you for your reply!

Best regards

Reto

  • 0
    Guru 317280 points

    This device requires a clock source with a tolerance of at most 100 ppm. A more stable clock with 50 ppm allows larger packet sizes (see table 8-3).

    The worst frequency stability option of the SiT1602B is 50 ppm, so it is perfectly fine.