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Re: [avr-gcc-list] ADC anomaly

From: Mattias Svensson
Subject: Re: [avr-gcc-list] ADC anomaly
Date: Tue, 17 Feb 2004 11:11:17 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030915

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.

Mattias S

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