Hello,
I'm trying to invert a -15V rail and step it down so I can connect it to an ADC input and get a voltage measurement.
My plan is to use an opamp to invert the -15V, and I was hoping to use the opamp in a single supply mode with 3.3V for +VS and GND for -VS. The problem I've noticed is that a lot of opamps will experience reverse breakdown of the ESD diode when the inputs are lower than the -VS rail. Also, ideally, I do not want to use the same -15V input I'm measuring as the V- rail on the opamp.
Would it be possible to use the op400 in this unipolar mode I described with a -15V input? Would there be sequencing issues or anything else I'd have to worry about?
If this isn't the right part for this, could you please suggest another space-grade part?
Thanks,
Anthony
