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

[KD0GLS]

With all the discussion lately regarding DDS and CORDIC, I'm reminded of a question that came up some time ago for which I've never found an answer.  Perhaps you enlightened people can enlighten me.

Given a complete DDS chip with a single output channel (e.g. AD9834, AD9835), why would one device favor a cosine LUT versus a sine LUT?  On the surface, starting the roller coaster ride at the top of the hill (assuming the phase accumulator starts from zero) seems odd.

.73,
Brent, KD0GLS, Minneapolis