Setting Comparison frequency in HMC-C070

Question

Hi I want to use HMC-C070 Microsynth module with 100MHz REFin. The datasheet states that REFin input can be up to a maximum of 220MHz, however comparison frequency should be less than 75MHz. 
 Fref=Frefin/R. 
 I believe, i need to set the R value to prescale Reference signal. I was not able to find where to set the R value in the register map.

ADIApproved · Accepted Answer

the process for setting the fvco is given below. the associated registers are explained. i will attach a link to the users guide. I hope this helps. 
 http://www.analog.com/media/en/technical-documentation/user-guides/microsynth_operating_guide.pdf)

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Setting Comparison frequency in HMC-C070