AVR-Chat

On Sun, 27 Nov 2005, James Washer wrote:

> I need to measure voltages in the 0-50mV range. I suspect the answer here is to use an amp
> to get this to a more reasonable level (say 0-2.5V) however I was wondering if it is ok to
> just supply AREF to 0.1 volts.. I suspect this is a bad idea, but I wanted to know for
> sure.
> 
> thanks
> 
> - jim
> 

Probably the worst problem you will run into is noise on the line.  With 
such a low reference voltage, the noise is going to take a more extreme 
part in the measurement.

Zack