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How to Calculate MOD and FRAC values for ADF4351 manually?

Question asked by chinta.shanthi@eldaas.com on Jan 8, 2014
Latest reply on Jan 9, 2014 by chinta.shanthi@eldaas.com

Can any one suggest, how to calculate the MOD and FRAC values for ADF4351 manually?

I'm able to get the MOD value for certain frequencies when i am using the below formula

 

                         MOD=PFD Frequency/Channel spacing*1000

 

But i'm unable to get the correct values if i'm using the above formula for certain frequencies like 3851MHz,1254MHz,2704MHz,....etc

 

Is there any other formula to calculate MOD and FRAC values manually?


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