> And you might not be able to do a sawtooth wave, since this is
> an audio DAC

I don't think that's a limitation. I'm only just starting with the 33F (for
audio applications too), so can't offer a solution to Martin's problem,
but take a look at Fig 22.2 of the d/s, which shows a ramp input and
a two-phase sawtooth output. If you can set the DAC to any output
value you should be able to create any waveform

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