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LMX2491: Spurs at output signal

Part Number: LMX2491

Hi team,

Customer configured LMX2491 as below attachment. And they found that there are some spurs sometimes near the main frequency. You can see in the video. Could you pls help me to understand what's more experiments I can do to analyze this kind of issue? Or do you have any comments on this issue? Thanks a lot! 

LMX2491 PLL register configuration 20230413.xlsx

 

BRs,

Rayna