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Voltage translation using ADuM140D

Reading the data sheet of the ADuM140D it seems possible to use the device as voltage translator between two different circuit sections (i.e. Vdd1 @ 5 V and Vdd2 @ 3.3 V), but all the specs are referred to the condition Vdd1=Vdd2, at 3 different voltages: I would know how to pick the proper characterization when Vdd1 is not equal to Vdd2.