AVR-Chat

At 09:53 AM 11/2/2004, Larry Barello wrote:

>Place a capacitor between Aref and ground (the analog ground).
>
>The accuracy of the conversion is better than .5%, but depending upon your 
>VCC accuracy, your absolute accuracy won't be so good.  At room 
>temperature most +5v regulators are pretty good, but you definitely won't 
>get the accuracy over temp without an external, calibrated reference.

On the tiny-26, I got Vref values of 2.7V. Not very encouraging. We used an 
external ref.