ADF4158

Hi, it appears you are using all default values so this should work okay. Have you made any modifications to the eval board or is it new out of box? E.g. are you using on board reference or external reference, and are you using the default loop filter and VCO?

Do other VCO frequencies lock to the wrong frequency?

Could you send a spectrum plot of your measurement when the device is locked at wrong frequency and maybe take a measurement of vtune at T7. If you program muxout to show lock detect, is this signal high?

Regards,

Alex

Marked as answered due to lack of reply