Hi Ryuji
Unfortunately the designer has been out of office on vacation and will not return until next week.
If you need to communicate with your customer before next week, please use the guidance that the 1.5V limit applies to any two analog input pins.
So the magnitude of the voltage difference between any 2 of the 8 VIN+ and VIN- pins should be limited to less than or equal to 1.5V. This would cover VIN1+ to VIN1-, or VIN1+ to VIN2+ or VIN1+ to VIN2- or VIN1- to VIN2-, etc. All possible combinations of input pins must have a voltage difference within the 1.5V limit.
In addition, any analog input (Vinx) must be between -0.15V to +2.0V measured with respedt to GND = 0V.
I hope this is helpful.
Best regards,
Jim B