AVR-Chat

On Fri, Feb 5, 2010 at 12:37 PM, Steve Hodge <steve@terrafirma.us> wrote:
> The Atmel data sheets, at least the ones I'm dealing with, say the "ADC is
> optimized for analog signals with an output impedance of approximately 10 K
> or less".   Does anyone have any experience about how much you can exceed
> this 10 K?

Depends on how much precision you want to loose, and there are no hard answers.
A buffer amp will let you have >1Gohm, and there are some flea-powered
opamps out there.