ADF4360-7 Not locking


I have a design that uses a 4360-7 and I am unable to get it to lock. I have used ADsim to generate the parameters for a 1GHz output frequency. I have the R counter set to 2 which gives a 5MHz PFD frequency from a 10MHz ref clock. I have validated that I get this frequency from the MUXOUT pin. I also have the prescaler set at 8 and a N counter value of 25. However if I look at the N counter I see nothing on the MUXOUT pin. So can someone please tell me why I would not be seeing anything on this pin. Is there anything else I can try to debug the device?


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