What is the difference between REFIN- and REFGND

I'd like to know the difference of role of reference pins, especially REFIN- and REFGND.

I've evaluated ratiometric bridge measurement with AD7195 and works fine.

Now I'm considering AD7765 to get more sample rate on same ratiometric bridge measurements.

Can I connect REFGND to external reference input and use it as like REFIN- ?

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