Re: [avr-gcc-list] ADC anomaly

[Douglas Dotson]

The whole device is running off of battery.

Doug

--- Richard Urwin <address@hidden> wrote:
> On Monday 16 Feb 2004 12:53 am, Douglas Dotson
> wrote:
> > Do you mean the internal reference or the
> reference
> > that is selected with the MUX4:0 bits set to
> 11110?
> > I don't see any specs on the accuracy of that
> voltage.
> > I'm not using the internal 2.56v reference due to
> the
> > inaccuracy. I'm using a precision 2.5v external
> > reference that appears to be stable to within a
> couple
> > of millivolts.
> >
> > I understand what you are saying about thermal
> > equilibrium. But in this case just tapping the
> reset
> > button wouldn't be cause for the thermal
> equalibrium
> > to
> > be upset. Also, the beast has been setting here
> for
> > several hours and hasn't drifted a bit from the
> > expected value. Go figure :)
> 
> I think there must be 10mV of noise on the analogue
> power supply around 
> reset. Analogue power is separate from digital
> power, yes? Have you 
> tried running the analogue stuff off a battery?
> 
> -- 
> Richard Urwin
> 
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