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CDCV304 Phase Jitter

cafain
Mastermind 6775 points

Other Parts Discussed in Thread: CDCV304

Hi.

Please tell me about jitter properties of CDCV304.

1) Does CDCV304 have the specification of "Cycle to Cycle jitter"

2) In addition, what is the difference between "Cycle to cycle jitter" and "Phase jitter"?

3) How much period is Phase-jitter listed in a data sheet prescribed with (cycle number) during?

Best regards

  • 0
    TI__Expert 3520 points
    Hi Cafain,
    Regarding the second question The Cycle to Cycle jitter (C2C) is the variation in cycle time of a signal between adjacent cycles. so it doesn't refer to an ideal cycle like period jitter. typically it's reported as a peak value. This type of jitter is reflecting the short-term jitter performance. so when the clock has some slow modulation (like spread spectrum), this metric is more suited to show the performance of the clock.

    So for the first question: CDCV304 is a buffer which doesn't support spread spectrum, so it has no C2C specified becasue it's not needed.

    Buffer noise is typically indicated as additive jitter, which in addition to the clock source jitter let you predict the total output RMS phase jitter (simply : phase jitter)

    for the third question : I don't really understand it, can you please clarify?
    Regards,
    Ahmed
  • 0 in reply to Ahmed Noeman
    Mastermind 6775 points

    Hi Ahmed-san

    I thank for detailed explanation.

    The inquiry contents No3,

    It is the measurement condition that attained a price of "Phase jitter" written to the data sheet.

    For example, the rms level that measured 100 cycles or the 100 cycles peak level which I measured.

    Best regards

  • 0 in reply to cafain
    TI__Genius 10320 points

    Hi Cafain,

    The phase jitter number in the DS reflects the integrated phase noise given by the integration BW in the table. One can take this RMS jitter number and easily calculate the peak to peak jitter - for example, standard JEDEC practice calls for this to be measured over 10k cycles which equates to a standard deviation scaling factor of +3.719.

    Gabe