AnsweredAssumed Answered

ADF4351 PLL Lock problem

Question asked by pichonro on Jul 30, 2015
Latest reply on Aug 12, 2015 by rbrennan



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.


Best Regards