Could you helps to take a look this confusing.
This is the Analog Inputs requiremnt for AD7792.
For Absolute AIN Voltage Limits, when active or inactive the internal BUFFER and In-Amp, AD7792 have different requirement for Absolute AIN Voltage. Also, this chip have Common-Mode Voltage requiremnt.
So, my confusing is:
made a example:
1\Active the In-Amp, set Gain=4, Absolute Ain(-) =350mV, Absolute Ain(+) =400mV, whether this configuration can work well?
2\Unbuffered mode, gain=1(no in-amp), Absolute Ain(-) =0mV, Absolute Ain(+) =100mV, whether this configuration can work well?
Whether example 1 and 2 have same issues: don't match the requirement for Common-Mode Voltage.
How this 0.5V be designed, could you introduce more details about why we have to keep Common-Mode Voltage bigger than 0.5V.