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CDCVF25081: Feedback Input Non-monotonicity

Jennifer H
Prodigy 60 points

Part Number: CDCVF25081

Hello, 

In an application where an unused output is connected to the feedback pin (pin 16), will non-monotonicity at the feedback pin have an impact on the other outputs?  

Thanks!

  • 0
    TI__Genius 16461 points

    Hi Jennifer,

    Can you explain why you would connect an unused output to the feedback pin? The main impact is that this will no longer be a zero delay buffer, as the phase determinism achieved by feeding back the running output would be lost. This should not impact the other outputs from running, but they will not longer be deterministic with the input signal.

    Thanks,

    Michael

  • 0
    Prodigy 60 points

    Hi Michael,

    By unused, I mean unloaded. The datasheet specifies tying the FB pin to one of the clock buffers' outputs to complete the feedback loop of the internal PLL. When I said unused, I meant one of the clock buffer's output pins that is only tied to feedback and not connected to another receiver as well. 

  • +1 in reply to Jennifer H
    TI__Genius 16461 points

    Hi Jennifer,

    That should be fine. There should be no impact on the other outputs.

    Thanks,

    Michael