> If so, isn't the PWM output a square wave, so my analog input
> will only match if it hits vss or vdd? Or is that what the low pass
> filter fixes?

Yes, it integrates the wave to a DC voltage. It depends on the
values and quality of the filter (eg a simple RC) and the mark:
space ratio or duty cycle of the wave. Getting 10mV resolution
in 30us might be a big ask

And BTW, thanks for saying thanks. So many / too many people
have lousy manners

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