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Tuneword calculation

Question asked by muthukumarvg on Sep 13, 2016
Latest reply on Nov 11, 2016 by ABuda

Hi i am using AD9912 to generate frequency from 73MHz to 100MHz. while calculating tune word my decimal portion is getting truncated due to integer division. So my tuning accuracy is affected. I am using keil with ADuC7026. kindly help me in this aspect.my problem is software.

FTW is 48bit and my register are 32 bit. Also decimal truncation.

Formula is FTW = (Ftune*2^48)/Fs

 

Fs is 999mhz and Ftune is from 73-100mhz

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