Trying to use the ADF4153 with 16MHz ref clock and part is working well when the MuxOut set to 3 state out. However, when I try to look at the MuxOut to monitor the R and N counters, I see the Ref Clock fly everywhere. But if I cut the trace on the MUXOUT line from the ~ 1.5" to < 0.5", everything is fine.
The datasheet shows nothing about proper configuration or loading when MUXOUT is used in R Counter or N counter modes. Does it need to be buffered?