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AD9910 parallel port and FTW

Question asked by hiro.sp on Dec 6, 2012
Latest reply on Jan 25, 2013 by hiro.sp

Hi

I saw the datasheet but I don't understand (also )how work it.

 

at parallel port frequency modulaion mode,

the terms  are

 

1.FTW reg.(32bit)

2.parallel port value(16bit) (PAR)

3.offset (FMGAIN)

4. finally used TUNING VALUE for Frequency gen.(TV) 32bit

 

I think that TV is calculated like below,

 

TV = FTW + ( PAR << FMGAIN );

 

here, first my question, the equation is right ?

 

and, PAR is unsigned value, so Is center frequency  determined with the half of MAX-PAR value?

 

Thanks for your help

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