ADF435x PIC
From UK Microwave Group Wiki
Not the ADF435x device , but for the MAX2870 http://www.g4jnt.com/MAX2870%20Control.pdf
Or the more upmarket ADF5355 http://www.g4jnt.com/ADF5355_Synthesizer_Control.pdf
Each requires it's own PIC controller to translate data sent as HEX / ASCII on a serial RS232 interface from custom programming software.
Synthesizer control generally, http://www.g4jnt.com/Synthesizers.htm
