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HMC699 Programming Registers

Question asked by JTORRES on May 24, 2018
Latest reply on Jun 13, 2018 by dyoung1

Hi All,

 

I am involved in a new design based on HMC699, I need to generate a 5920MHz signal with a reference input of 20MHz.

 

I have simulated the system using ADISim PLL and the chip programming assitant Gives me 37 (with other names) for the programming register, but from the datasheet I get A=36 S=0.

 

  

 

 

Fvco=5920MHz

FXtal=20MHz

N=Fvco/FXtal=296

 

A=int(296/8)-1=37-1=36

S=296-(8*(36+1)=0

 

With A=37 the system would not work because it would give S=-8

 

Could someone tell me what is the correct value? Am I doing anything wrong?

 

Thanks in advance

Javier

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