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DP83910A operation at slower speeds

Other Parts Discussed in Thread: DP83910A

I would like to use the DP83910A, but it's 10MBps bit rate is a little high for my application. I thought about using a 2MHz external clock instead of a 20MHz clock oscillator, but I'm not sure how flexible the chip's PLL is with different clocks. Please advise me on whether it is possible to reduce the chip's clock rate as I have described, or if there are other ways I could go about it.

  • Hi Greg,

    It is not advisable to adjust the frequency of the clock.  As you can see in the spec crystal accuracy require is 50 ppm.  Outside of this range the device may not even start up, let alone communicate reliably.  This is not an effective way to control the bit rate.

    Perhaps using a different physical layer standard may be in order if you are looking for 1Mbps.

    Best Regards,