DVDdoug:
I have no idea, but it would depend on your filtering. Do you understand what PWM is?Do you understand the limits of 8 bits? With 256 steps your quantization noise is 1/256 (before filtering) and that's not even in the same universe as 1nV out of 1V. And, that's with a normal DAC. PWM will be worse.
OK so if I used a DAC, what would you suggest in terms of filtering? Thanks