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WEBENCH® Tools/LMX2594EVM: LMX2594EVM

sohail ahmed
Prodigy 40 points
Part Number: LMX2594EVM
Other Parts Discussed in Thread: LMX2594

Tool/software: WEBENCH® Design Tools

Hi,

Sir i am using lmx2594 and locking only one frequency that is 4340 MHz, and i am using the ref clock 100MHz and my PFD is 200 and doubler i am using  and my seetings are 100MHz ref clock,doubler ,prediv1,multi is by pass post div is 1 and ,y PFD is 200.when locking the single frequency that is 4340 MHz getting spurs and after some time noise floor is jumping, i am not understanding why it is happening can u please suggest me how to solve my issue.

With Regards,

Ahmed

  • 0
    TI__Guru** 107830 points
    Hi Ahmed,

    I assume you use TICS Pro to control the board.
    After changing the frequency parameters, did you see some boxes being highlighted in yellow?
    If so, you can mouse-over to the boxes to see what is the suggestion to clear the color.
    in this case, I can see the PFD_DLY_SEL is in yellow and the suggestion is to change it from 4 to 3. This register bits will affect phase noise and spurs.