AVR-Chat

David Kelly wrote:

> Am a bit disappointed in the accuracy of the internal 2.56 volt
> reference used by the A/D converter. Have a nice 3.3 volts on the chip
> supply. A 0.1 uF ceramic cap across AREF and GND. Nothing connected to
> AVCC.
> 
> Working the math backwards agrees with the voltage measured across the
> 0.1 uF capacitor, that my reference voltage varies from 2.44 to 2.60 on
> different units.
> 
> Is this typical?
> 

VERY, I am yet to find a "good" reference on a uC, but as far as cheap 
ones go, I am using the ref2940 (IIRC) from TI, they are cheap, neat and 
in a 3 pin sot23, take up little space and work well :)

Regards,

Kat.

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