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ADF4002 reference Spurs

Category: Hardware
Product Number: ADF4002

Hi, 

I am using EVAL-ADF4002 with external 10MHz reference signal and -50dBc reference spur was observed.

I am using CVC055CW-0100-0200 VCO from Crystek microwave and PLL register setting:

Test result: 

How can I minimize 10MHz spur? thank you.

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