On 4/22/2012 4:49 AM, Forrest Christian wrote:
> 1) I am unable to find any difference amplifier which runs at 3.3V and
> supports the necessary common mode range of 0 (-2 would be better) to
> 65V.   Some are close (the AD8207 for instance looks great until you
> realize the +65V is only at 5V).   I'm ok with one which has an
> integrated ADC as well...    I also am hoping for something which is a
> $1-$2 part, not a $5 part, since I use a lot of these on these boards.

The closest thing I could find is the Max9611.  It runs from at least=20
2.7V and supports -.3v to 60V  and differential max of +-65V.   It is a=20
bit more than just an amplifier, it includes ADC and i2C interfaces but=20
the price doesn't seem too high, showing $2.68 at mouser qty 1.

Hope you find something that works.
Mark Hanchey




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