Specific voltage no problem for my apps, as long as I know the =20
reference voltage (or Vdd here) will stay within a specific tolerance =20
over a fair temp range.  I can always add some code to calibrate each =20
unit for the specific voltage.

It's not such a big deal currently as switching converters are coming =20
down in price to where I'm now looking into switching over (pun most =20
certainly intended!) to those.

Cheers,
-Neil.


Quoting IVP <joecolquitt@clear.net.nz>:

>> generic 7805's with and external Vref chip (AME385BEETZ or
>> LM4040) is best solution
>
> On occassion I use a jacked up 5V regulator to get 5.120V for Vcc
> and Vref (5mV per ADC bit). It's not difficult to keep it within 1%,
> 5.069 to 5.171 -> 102mV range, with a couple of R and a trimpot
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