[time-nuts] DDS - Cosine v. Sine LUT

KD0GLS kd0gls at mninter.net
Tue Jun 21 19:03:49 UTC 2011

> On Jun 21, 2011, at 13:39, Chris Albertson wrote:
> I used only 90 degrees of the table.

Yes, as did I and most implementations, but why a cosine quarter-table instead of the more common sine?  A quick look at the data sheets (and the waveforms in the theory-of-op sections) for the two devices suggests they are clearly calling out one or the other, but without rationale regarding the choice.

Brent, KD0GLS, Minneapolis

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