For the AD5721R what mode should I select if I use VDD=+5.5V and VSS=-5.5V to generate a  +/-4.5V Vout? Shall I use m=8 and c=4 ( +/-10V range) or m=4 and c=2 ( +/-5V range) ?

The transfer function is:

#AD5721R range setup

Vout can not reach +/- 10V if VDD=+5.5V and VSS=-5.5V. Vout can only reach +/-4.5V due to the 1V drop. But how shall I program RA to get +/-4.5V Vout?

The documentation states that the register RA is used:

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