Hi Hank

If you're planning to use the digitally synthesised sine wave for audio purposes, please re-consider the number of samples. 16 samples are good enough to generate a sine wave for the CRO, but for the ear,.... well, it's a different game altogether.

I had used the DDS technique, albeit with a PSOC, to generate pure tones (sinewaves of fixed frequency) for a clinical audiometer. You will get a clean sine wave on the scope, but, the distortion present in the wave will make it unsuitable for any audio purist. So, I had to switch over to the AD9832 which should be quite similar in function to the 9835(I haven't checked)

The AD9832 is a 1024 point sampled wave DDS IC. The results I obtained from this are just excellent. Before this, I had used a ML2036 which is now obsolete.

You might achieve the tones, but, you may not like the sound you get using a 16 point DDS. Let me not discourage your collaborative effort, but look at it as a gentle helmet I've gifted you to save the remaining hair on your head LoL

Cheers