POT jitter on ADC???

[Batz Goodfortune]

Y-ellow Harry.
	Thanks for that. Much as I thought.

>3) How fast can the supply ramp down... this is the problem. The diodes up
and down
>would protect the ADC here, the voltage can never go more than one drop above
>whatever the rail is... a series resistor to the ADC might be extra
insurance.
>Shottky diodes have even lower forward voltage 1N5817 is about .35-.40 volts.

Yeah. That's the kind of drop you'd need. The Ab-max is usually 0.3 volts
above Vcc. Someone on the ATMEL list sent me some averaging code which
apparently gets rid of jitter but with only 3 bytes of program memory left
there's little chance of implementing it.

Paul P also suggested that if the cap was sitting right on the half LSB,
there could be just as many problems as with no cap at all. Although I'm
pretty sure I have halved the input word (rotated right one bit) before
doing the comparison. Which means that the jitter has to be 1 whole LSB
before that happens. In theory anyway. I'll have to go back and check that
I didn't do something stupid like Rotate it after I've checked for a change.

It's not a huge significant problem at the moment but it certainly could
be. And likely to occur bit time at the worst possible time. Like during a
gig or something. It doesn't crash the machine but it does drive it nuts if
it happens on boot-up.

Now to find some Shottky diodes.

Thanks for that. Most appreciated.

be absolutely Icebox.

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