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ADF4355 output spurious questions

Category: Hardware
Product Number: ADF4355

Hi,

     We had used ADF4355 for our clock, we found a problem.Our frequency output is OK when it is below 6.1GHz, but when we set frequency is greater than or equal to 6.1GHz,it not work normally. The output will jitter and there will be some rest of the spurs next to it.
Configured to 6.2GHz, the output is as follows.

What are the causes and how to solve this problem?