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Re: [avr-gcc-list] ADC Internal Voltage Reference accuracy.


From: E. Weddington
Subject: Re: [avr-gcc-list] ADC Internal Voltage Reference accuracy.
Date: Fri, 13 Feb 2004 15:00:03 -0700

On 13 Feb 2004 at 13:45, Douglas Dotson wrote:

> I am using a Mega32 ADC using the internal 2.56v
> voltage reference. I'm not convinced that it is
> providing 2.56v. It appears that I can measure
> the voltage at the Vref pin. If so, it measures
> 2.464v. I can connect an external reference but
> I would to use the internal one as long it is 
> accurate enough.

It's been my experience, at least on the mega128, that the internal voltage 
reference for the ADC is not very accurate. IMHO, I would suggest using an 
external reference that is known to be accurate and stable.

HTH


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