AVR-Chat

You probably CAN do it if you bias the second input
correctly. This might mean, for example, biasing one input
at Vref/2. Or, you might bias both inputs from a common
voltage divider and AC-couple the signal into the active
input. But you will need to watch out for impedance errors
(impedance can't be too high or there will be errors due to
current flowing into the S/H when it pulses).

Jim

On Thu, 24 Feb 2005 17:35:08 +0100
 Magnus Johansson <rnd-avrchat@rnd.se> wrote:
> 
> 
> 
> 
> 
> 
> > Differential inputs measure the difference between
> the two inputs.
> > If the - is at 3V, and the + at 4V, then you'll see
> 1V.
> > They are commonly used for measuring current, with a
> sense resistor.
> 
> Yes, that part I got, but in the table there's
> differential inputs with
> (one example) ADC0 in both positive and negative column.
> I was sort of
> hoping I could use it as I would a single ended input but
> with the gain
> available. I've now tried and can't get it to work so I'm
> mostly curious
> why those combinations are in the table in the first
> place, and not
> marked out as unusable or something...
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Yahoo! Groups Sponsor
> 
> 
>   ADVERTISEMENT 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> Yahoo! Groups Links
> 
> To visit your group on the web, go
> to:http://groups.yahoo.com/group/AVR-Chat/ 
> To unsubscribe from this group, send an email
> to:AVR-Chat-unsubscribe@yahoogroups.com 
> Your use of Yahoo! Groups is subject to the Yahoo! Terms
> of Service.
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 

---------------------------------------------------------------
The Think Different Store
http://www.thinkdifferentstore.com/
For All Your Mac Gear
---------------------------------------------------------------