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Gigabit Ethernet CDR

Daniel Wisehart
Prodigy 10 points
Other Parts Discussed in Thread: DS110DF1610

I have an FPGA with LVDS inputs fast enough to receive 1.25 GHz (+/- 100 PPM) data, but I need to do external clock recovery.  A number of the TI retimer parts do CDR internally, but none of them seem to bring the recovered clock out.  What is a good way to recover the clock using TI parts?

Thanks,

Daniel

  • 0
    TI__Mastermind 29655 points
    Hi Daniel,

    I cannot think of an IC that is good fit here that will not require an overkill solution. It may be possible to configure a device like the DS110DF1610 to operate such that one output in the internal crosspoint is sending out data while the other is sending out the internal oscillator clock. The issue I see here is that the output clock is from a different CDR circuit within the chip than the one used to retime the data.

    If you are looking for a solution that requires the IC to output both data and the recovered clock used by the CDR circuit, I am unaware of a part in the portfolio that provides this capability.

    Thanks,

    Michael