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ADF4360-8 vtune CP filter


I am trying to figure out what purpose the filter between vtune and CP has, as that is not really explained in the datasheet.

Obviously it is a low-pass filter, but what is it filtering?

What impact does it have on frequency selection?

I would have loved for there to be some equations explaining the functionality of this filter, so I could manually calculate an appropriate filter, but sadly there aren't any.

Any help is much appreciated.

Best Regards