[time-nuts] V standards

[Hal Murray]

> You don't want 24bit PWM, you want to combine a normal DAC with PWM
> modulation.

> The disadvantage is that the result is not linear.  But it is
> monotonic and approximately the lower 4/5th of the distinct
> combinations are practically useful. 

Where is the non linearity coming from?

Why is only the bottom 4/5s useful?


> If you use a 16 - 18 bit fine dac, and 6 - 8 bits of a coarse dac then
> this works quite well, and with a low aging SC-cut crystal you may
> never see a coarsedac change, while still having over 21+ bits of
> overall resolution. 

How does the stability of a course DAC compare with a pot?


-- 
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