My question is the following: is it possible the ADG706 to supply with +/-5Volt
No it is not.
Dual 2.5 volts supplies are the highest that ensure the IC meets all its
At +/- 3.5 volts or more you will exceed Absolute maximum ratings and damage
The bottom line here is that we will not guarantee datasheet max/min values
when the ADG706 is operated at +/-3V supply.
Since this is within the max ratings for the part it therefore will not be
damaged at +/- 3V.
If you can live with slightly higher Ron, I would suggest a move to the ADG658
or ADG608 (more reasonable Ron) as an alternative as guaranteed specs are
available for +/-3V operation.