It looks like the chips require split +/-5V supply.
No, they don't require it at all, they will run with the analog rails (Vdd, Vee) from 3 to 18V apart.
However the logic inputs are referenced to Vss and Vdd - this means that it makes sense to
have Vee at -5V if dealing with analog signals that are AC centred around 0V. In that case Vss will
be 0V to allow the logic inputs to work (Vss = 0V, Vdd = +5V, same as logic)
However you can common Vss and Vee if you want. However the logic rails need to be approximately
the same voltage as the analog supply then - the logic LOW/HIGH thresholds are between Vdd and
Vss. If Vss = 0V and Vdd = 9V then 5V logic probably won't drive it. A level-shifter would be needed.