Good day. My Customer is using ADS124S06, it always measures +-1V differential input and it is the only differential voltage it will measure. They used the Bipolar Analog supply configuration given in the datasheet Figure 119. They also want the internal reference (2.5V) as a bias node for external circuitry.
The question is if REFCOM is connected to AVSS(-2.5V) then they would see 0V on REFOUT but they need 2.5V on REFOUT. So they are thinking to connect REFCOM to AGND or board Ground because they will never measure any -ve input voltages so that they can see +2.5V on REFOUT. Is it ok to do so? If not it means they can never use the internal reference to bias external circuitry when bipolar supply configuration is used?
Can you also explain how internal reference is derived?