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AD5791 Versus AD5790 Vout Equation

The AD5791 and AD5790 DACs appear to be very similar devices, yet their respective data sheets have different equations for the output voltage.

The AD5791 equation seems to be a bit of an anomaly as most other ADI DACs do not include the minus 1 term in the denominator. 

Is there a mistake in one or the other data sheet?

From AD5791 data sheet:

From AD5790 data sheet:

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