Q1 - The datasheet of the LMP2012QML-SP OPAMP specifies the absloute maximum limit of the supply voltage to be 5.8V. Do i understand correctly that this referes to the voltage difference between the two supply pin i.e. V+ - V-?
So using this part with V+=+5V, V-=0V or V+=+2.5V, V-=-2.5V is ok but V+=+5V, V-=-5V would exceed the specification.
TI Answer,
Yes. Correct.
Op-amps do not have “ground” pins, so the amplifier lives “between” the supplies.
VS = (V+) – (V–)
V+= +5, V- = 0V (GND) = +5V total. OK.
V+= +2.5, V- = -2.5V = +5V total. OK
V+= +5, V- = -5V = +10V total. NOT OK because > +5.8V.
To find more about LMP2012QML-SP, click to see details from Original TI Support Forum