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ADA4930 supply voltage

Hi,

I'm pretty new to PCB designs, and in datasheet of high speed differential amplifier ADA4930 , I don't understand what voltage I should supply to this device.

They say 3,3V or 5V with +Vs and -Vs so I suppose +3,3/-3,3V or +5/-5V ; but in test circuits shown a bit further p.15, they grounded the negative voltage input.

In the case I actually need to power with negative voltage (-3,3V or -5V), which converter should I use to generate a negative from positive supply ?

Thanks