what is the relationship between the AWG maximum conversion rate (1MS/s) and analog bandwidth (66kHz)? Is it limited by a power amp ("low output impedance")?
The 66kHz is just a lowpass filter that I have on the output amplifier, this is to make the discrete steps from the DAC look more continuous. I'm actually going to decrease the filter frequency to 44kHz to minimize unique parts on the board.
To be able to create distinguishable waveforms, I decided to have a minimum of 32 samples per cycle. So, with 1MSPS, the maximum frequency that I generate is 31.25kHz. This could be changed to output higher frequencies, but then the triangle wave would look similar to the sine wave.
Also, with the 1MSPS rate from the microcontroller's DAC, the maximum output frequency is 500kHz, the next possible frequency would be 250kHz... So there are big gaps if using the highest frequencies.