Dear sir or madam
We are using the LM2901AV and the datasheets requires that the Common-mode input-voltage range stays below Vcc-2V.
My questions is: How do I calculate the Common-mode voltage?:
1. Ucm = (Uplus + Uminus) / 2; E.g. Ucm=(2V+5V)/2=3.5V
2. Or is it the lower voltage of the maximal voltages on one of the two inputs. E.g. Uplus.max=2V; Uminus.max=5V; Ucm=2V
If the device is suppiled with 5V, case 1 would violate the VICR stated in the datasheet, where case 2 would be fine.
Thanks for your answer
Regards Lars Hummel