I am trying to interface with negative voltage input signal ranging from -5V~5V or -10V ~ 10V.
Since the input signal may be floating or have ground reference, I am planning on galvanically isolating ADC and input side from everywhere else.
I am considering flowing configurations in below picture.
The absolute maximum voltage on the input pin of the ADC(AIN+ and AIN-) are -0.3V to (VDD+0.3V).
If I use the first configuration for +/- 5V range signal(floating or not floating), will it be able to get the signal correctly?
Also, the system may have to interface with +/- 10V range signal, I used simple resistive voltage divider in order to take the voltage level down to acceptable range.
Please look at the configuration and see if it's viable.