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Issue of ADF4159 output frequency affected by mux out

Question asked by lee911 on Nov 22, 2017

Dear All,

Currently, I've got a new claim that ADF4159's output frequency is affected by mux_out signal.


I set the muxout's ramp time to 250us as the below




Then I can figure out the 4Khz frequency with muxout frequency. 


What if I turn mux out off then I can get the clean frequency but If turn on, then I get the muxout affected output frequency.


How do I get clean output what is does not affected by mux out?