[hpsdr] new DDS

[Lyle Johnson]

>> Interesting feature is 'SpurKiller'technology.
>
> ...Given the phase in
> the accumulator and the frequency,  you can mathematically compute the 
> frequency, phase, and amplitude of these spurs to high accuracy.  They 
> have chosen to take N of them (it looks like up to 3), invert them and 
> add them to the output effectively suppressing the 3 worst (if I read 
> this correctly).

The data sheet suggests that the D/A non-linearities require that the 
computed values be tweaked; the same value won't work for suppression in 
multiple instances of the part.

73,

Lyle KK7P


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