interfacing to max127 and i2c

i would like to use the 0 5v range and the schematic i'm using is the one you can see on the max127 datasheet (so, yes i'm using internal reference).
...so ( if got the point) to have a 0 5v range i should send 0x80 and then get the replay , divide it for 16 and multiplay for 0.001?
is it correct?