Hello, I'm using the ADF4351 for sweeping in a band of 100Mhz to 200Mhz with 1Mhz step. When i try to program a frecuency that is multiple of 5 or 10Mhz i have no problem but when i try with other frecuencies (103Mhz or 159 Mhz for example) the PLL doesn't lock. What i am doing wrong?
I am not using the EVAL Board but i copied the schematic from the Eval Board User Guide UG-435.
I used the loop filter configuration shown in the Eval Board User Guide UG-435.
REF in= 10Mhz in a colppitts configuration.
This is a pic with an example of the configuration code for RFout=103Mhz
this is the loop filter: