I need to control the output phase of the ADF4351 relative to the input reference. I need help because I have not yet found the register settings to do this. I am using the ADF4351 to synthesize 50 MHz from a 25 MHz reference clock. I need to be able to program the phase relationship between the 25 MHz reference clock and 50 MHz output in 4000 increments using the 12-bit phase word. I am using the ADF4351 Eval Board, but have not been able to find a setup that allows me to control the output phase.
The first image below shows my overall setup, but the GUI has changed some of my actual settings.
INT = 127
MOD = 4000
I set the phase word from 0 to 3999 in an attempt to change the phase, but this does nothing to the output.
The actual register settings cannot be depicted in the ADI GUI, so I have shown them in hex below.
Can anyone advise me on how to set the chip up to get control of the output phase?
Steve, Colorado Springs, CO