You've got several distinct parameters to keep track of. One is the AO Update Rate clock frequency, which must be an integer divisor of the 100MHz master timebase clock on your board. Another is your AO waveform buffer, which must contain an integer # of AO samples. Further, in addition to the timing resolution of your samples, you probably also care about the amplitude resolution. This desired amplitude resolution will put an additional constraint on the minimum # of AO samples you want per cycle. Finally, of course, these things must all work together to produce your sine wave at the desired frequency, with sufficient amplitude resolution.
If only someone had been down this road before and made a vi to figure it all out...
(And, by the way, hid it away in a thread that probably won't show up for the most likely keyword searches)
Seriously though, read the linked thread and maybe this one too. The key concept is that by defining the AO output buffer to contain multiple cycles of a repeating waveform, you can get almost arbitrarily good waveform frequency precision.
-Kevin P
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