I've been using TI's REF30xx references.  Sources 50 mA, provides < .2%
accuracy and is available in several voltages.

Unfortunately, it only comes in SOT-23 package.  Otherwise, I like it.

Mike H.

>Rant about useless internal voltage references.
>
>I originally titled this :Useless internal voltage references" but decided
>to change it.
>
>I'm interested in using a processor with (at least) 10 bit analog to
>digital
>converter accuracy.
>Most with internal A/D have band gap references. These have broad nominal
>voltage specs compared with the accuracy of the converter. eg 1.11 / 1.23 /
>1.34 min/typical/max  or about +_/- 10%. OK - maybe we can calibrate this
>initially. How good is it over temperature and voltage. Let's check the
>data
>sheet. Nope. No information whatsoever. It's hardly worth providing a +/-
>10% reference with absolutely no information on its characteristics. One
>may
>well be better off dividing down and smoothing Vdd !
>
>Looks like an external reference is liable to be essential. OK, I knew that
>anyway, but you'd think you'd get some help from the makers.
>
>What are other people doing?
>Are there a whole world of people out there using 10 bit A/Ds with a 10%
>uncharacterised reference ? ;-)
>
>
>
>
>         Russell McMahon
>
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