Right now I'm picking a current sense amplifier for my application, and I'm looking for for amplifiers with maximum offset voltage of below 50uV (and offset and bias currents in nA/pA range).
Luckily, I have found a few of them at a reasonable price, but they all seem to have GND pin and REF pin. GND pin is always marked in datasheets as ground (who could imagine).
For example: TSC212 Datasheet or NCV214 Datasheet
These amplifiers have a GND pin, and can work over wide supply voltage range. Since I want true zero output, I want to supply them with 3.3V at their Vcc and -3.3V at their GND pin, as well as GND (0V) at their REF pin to produce MCU ADC readable values referenced to 0V. However, the GND (negative supply pin) is marked as "Ground" in the datasheets, there is no explicit indication that I can use negative supply with them.
My electrointuition and familiarity with amplifier structure (to a certain degree) suggests, that I should have no problem using them with negative supply rails, since voltages are relative and bla-bla (excuse my scientific language). Nevertheless, I would want someone smart to confirm it for me (or maybe I'm wrong?). It's suspicious that negative supply voltages are not mentioned in datasheets.
Question: can current sense amplifiers with negative supply pin marked as GND work with negative voltage on GND pin, given supply voltage (V+ - V-) doesn't exceed the spec?
with maximum offset voltage of below 50uA
o_O ??? \$\endgroup\$