AD1938: what is the formula to transform the data received from AD1938 into volts?

I want to display a sine wave signal in a software program that I apply to the analog audio input of the codec. I get the data in the receive buffer, then convert it from a fixed-point format to a 32-bit floating-point format, but I do not know how to convert this data into an effective signal (amplitude in volts). Thank you.

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