I'm not following what the allowable ground referenced voltage is for the analog inputs on the AD7380.
The 7380 specifies an "absolute input voltage" of -0.1 to Vref+0.1.
I read that as telling me that I if I have a 2.5V reference the analog inputs must be between -0.1 and 2.6V. That means realistically I need a common mode voltage of exactly 1.25V to realize full +2.5/-2.5V dynamic range.
On the other hand that conflicts with my reading of the common mode range which is specified as 0.2 to Vref-0.2 or 2.3V?
This is an important point considering no buffer amplifier can drive all the way to ground without a costly negative supply. If possible I'd choose a common mode input of Vcc/2=1.65V and a 2.5V reference meaning my analog inputs would swing between 0.4V and 2.9V. That's realistic for a driver amp.
Finally the section on the input structure implies that anything between the rails is ok from the perspective of the diode protection circuitry.
So what is it?
(I asked this in another discussion but am now making it its own question).