j.chitte wrote:
> Could you comment on my understanding that the MAX197 in 0-5V mode is
> floating the input at 2.5V and hence requiring the op amp to sink current
> when the input is <2.5V ?
From my quick lookover of the datasheet I don't believe that's the way
it's supposed to work. On page 8 of the PDF it shows a equivalent
schematic of a single input channel. That shows a 12.5k series resistor
on the input, then a 5.12k pull-up to the voltage reference that's only
used in bi-polar mode and a 8.67k pull-down to GND. I don't see any
reason in that why your showing a 2.5v float on the pin, unless it's
using a external 2.5v reference and in bi-polar mode. Tried another MAX197?
--
Jason Stahls
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