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LMK5B12204: Using it as just a jitter cleaner

Kei Kuwahara
Expert 7660 points
Part Number: LMK5B12204
Other Parts Discussed in Thread: LMK05318B

Hello team,

My customer is looking for a simple 1ch jitter cleaner with integrated clock divider.

The input frequency will change from 10MHz to 100MHz on the fly, and the output should be as low as 150kHz.

Questions:

  1. Can LMK5B12204 be used for this condition?
  2. Where should I input dirty clocks, XO input or Ref Input?
  3. Do I still need to input ref clock for DPLL, even if I don't need phase sync features?

Best Regards,
Kei Kuwahara

  • 0
    TI__Genius 16565 points

    Hi Kei,

    1. 150 kHz outputs are not supported on the LMK5B12204. The next option is LMK05318B which has 8 outputs; OUT7 has two dividers that can be used to bring the frequency down as low as 1 Hz.
    2. Put the input frequencies into the ref input (PRIREF/SECREF).
    3. Yes. Since you expect to go down to frequencies as low as 150 kHz, the DPLL is required.

    Regards,

    Jennifer