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LMX2615-SP: Pre R devider and Post R devider setting

Katsu Matsunaga
Expert 7730 points
Part Number: LMX2615-SP

Hello,

My customer is observing a strange phenomenon with setting of pre divider.

Input frequency is 64MHz, then Pre-R = 2 and Post R = 1. This setting works correctly. But Pre-R=1 and Post-R=2 doesn't work even though Post-R frequency is less than 250MHz. No output is observed.

Could you tell me reason why this setting doesn't work?

Here is TICS-Pro capture image

Setting of handwriting doesn't work.

Please give your advise.

Best regards,

Katsu

  • 0
    TI__Genius 11900 points

    Hello Katsu-san,

    Are you toggling FCAL_EN after this change? If you are, then this is something I will need to test in the lab and get back to you. If not, please confirm you toggle FCAL_EN and still see no output.

    Update (8/12): I double checked this on my EVM. You should be able to use either PreR or R divider.

    Thanks,

    Vibhu