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Thank you for your help here. You can see the definition of phase reversal below. Customer is worried about below condition, when VS1 = VS2 = ±15 V and the input voltage higher than 15V, what will happened to the output? Thanks.
"Phase reversal is a condition that may occur with op amps and instrumentation amplifiers when the applied input common mode voltage approaches a voltage outside of the specified common mode voltage range. At that point the output slams to the opposite rail. It appears when the input pins were reversed."
I do not think this will be an issue since these devices are not op amps or instrumentation amplifiers. They are really delta-sigma modulators with a filter on the low side of the device. Please see this video for further information on basic device structure: https://training.ti.com/introduction-isolated-amplifiers
Under the described conditions I would expect the output to clip, not reverse. Additionally, the ISO124 will require some headroom from the voltage rails ~2.5V to operate without clipping.
