Now I've got a circuit
with an external symmetrical resistive attenuator in front of the Current Channel ADC.
Input signal is unipolar up to 0.9V.
This circuit is not fully correct as the common mode voltage (at IIN+ and IIN- inputs) exceed the Absolute input voltage range.
0.5V is more than acceptable 0.3V.
Nevertheless the ADC performs correctly at such common mode voltage.
Are there any hidden drawbacks of the slightly increased common mode voltage?
What reason of the limitation of the absolute input voltage range?