Re: [avr-gcc-list] ADC anomaly

[Richard Urwin]

On Tuesday 17 Feb 2004 10:11 am, Mattias Svensson wrote:
> Douglas Dotson wrote:
> > All this is on a breadboard right now. When I
> > layout the PCB, all the normal precautions will
> > be in place to keep noise to a minimum.
>
> Never underestimate the noise capabilities of a breadboard... ;)
>
> A PCB with proper AGND plane separated from DGND is the only possible
> way. And you should have the AGND plane go under the corner of the
> divice that has the ADC inputs.
> AGND and DGND should be linked in a star configuration, and only at
> one point. Preferably at the place you have the main power input to
> the PCB.

Yes, and with big cables going to the batteries.

-- 
Richard Urwin