AVR-Chat

Alright, I think me and my big mouth got schooled on this one. Thanks for the 
insight. 
-Micah 

On Monday 09 January 2006 10:50 pm, Roy E. Burrage wrote:
> It actually is a divider, Micah.  Each leg of the R2R ladder divides the
> output current by 2.
>
>
> REB
>
> Micah Stevens wrote:
> >Why? This isn't a divider circuit. I think I see what you're getting at,
> > but I'm not sure I'm buying it.
> >
> >-Micah
> >
> >On Monday 09 January 2006 1:57 pm, Jim Wagner wrote:
> >> Sorry, but wrong about the tolerance!
> >>
> >> Each successive leg has half the tolerance contribution of
> >> the leg just above it in the ladder. With 1% resistors, the
> >> over-all tolerance will be in the 3-4% range.
> >>
> >> What may be more critical is monotonicity, especially the
> >> step going from 0x7f to 0x80 (in an 8-bit) DAC.
> >>
> >> An R-2R DAC also relies on the on-resistance of the FETs in
> >> the logic output circuit.
> >>
> >> Jim