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LMX2572LP: phase detector frequency - lower limit

Andrzej Babij
Prodigy 30 points
Part Number: LMX2572LP

Hello,

I plan to use LMX2572LP at UHF, in integer mode, with phase detector frequency in order of 100kHz - of course rectangle shaped. In datasheet, the lower limit for phase detector frequency is however 0.25MHz. What is the reason for the limit?  What effects can occur when using the reference frequency below the lower limit?

Thank You for the answer.

Andrzej Babij

  • 0
    TI__Guru** 107030 points

    Hi Andrzej,

    The phase detector may not work at 100kHz, this was validated during product development stage. In production, we test each device at the min. of 250kHz, so there is no guarantee in performance if we operate it beyond datasheet specification.