I made a prototype with a ADF4351 to generate a 300 MHz signal.
But the PLL doesn't lock. The signal is at the good frequency but it sweeps.
I attached the output signal and the digital lock detect signal.
I have a 35 KHz loop filter like evaluation board and a LC balun for a 300-460 MHz output signal.
I don't think it is a programming problem because the chip responds to my orders.
Thanks in advance for your help.