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LMK03318: Configure output from PLL for best performance

Omer Kvitel
Prodigy 140 points
Part Number: LMK03318
Other Parts Discussed in Thread: LMK03328,

Hi

I would like to know if there is a limitation on the following issue:

If I configure the PLL for 50MHz, 100MHz,150MHz,200MHz, 125MHz, 156.25MHz - can I output the 50MHz near by the 100MHz, 150MHz, 200MHz or do I need to space the outputs?

Meaning output0 and output1 will not have the same harmonics?

I remember I saw something regarding this restriction with respect to phase noise and performance but I can not find it.

Maybe I am confusing it with a different type - I would like to check this is allowed.

If not, I highly appreciate if you can refer me to the appropriate article/application note.

Regards

Omer

  • 0
    TI__Mastermind 18070 points

    Hi Omer,

    If the 50Mhz, 150MHz and 200MHz are coming from the same PLL, then it is OK to have them close to each other. There'll be problems if you make both PLLs have the same VCO frequency in LMK03328 - which is not an issue in LMK03318.

    The crosstalk won't cause much trouble because these frequencies are locked to the same source and are phase correlated.

    Regards,

    Hao