Other Parts Discussed in Thread: INA282
If the +/-IN pins are truly independent of VS supply why is there an intra-phase common mode limitation of only 80v? Specifically if monitoring current intra-phase, how can +/-IN pins CMM ever rise above the very small drop of typical shunt values? Has the laboratory ever determined +/-IN insulation package breakdown voltage when the 240 is placed in-phase? Have they ever tried to see if a few parts blow up to verify +/-IN are truly independent of VS supply when 240 is placed in series with phase coil?
If the VS supply is truly independent of +/-IN pins does that not constitute +/-IN pin isolation barrier exists between the differential amplifier? Seemingly ground is isolated from +/-IN as the datasheet infers or VS current flow would not be possible. Therefore +/-IN would be isolated from typical ground to phase voltage levels, when 240 is placed in-phase B+ is >80vdc. Otherwise how are +/-IN pins made independent of VS supply not a false narrative under all possible mounting positions? Especially when there is no electrical proof or CUT to back up this odd claim....
Given 240 circuit CMM voltage may vary relative to circuit placement, why does datasheet AMR indicate +/-80v under all placement conditions? Seemingly the lower 80v CM might vary well be 1KV when 240 is placed in series with phase, if +/-IN are independent of the VS supply...