Hi Kevin,
The accuracy of the RFout from an integer N PLL will depend on the resolution of the N counter, for the ADF4360-9 , this is 13 bits...which depending on the available Reference may not be high enough.
Our fractional N , PLLs with programmable modulus allow for much higher frequency resolution...the ADF4351 is a possible candidate...
What Reference frequency do you have?
Regards,
Brigid.