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ADF4351 problem

Question asked by npeiro on Nov 7, 2016
Latest reply on Feb 21, 2017 by rbrennan

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?

 

Conditions:

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:

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