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PGA2311: Single Power Supply --> Va+ = 5V DC, VA- = GND?

Part Number: PGA2311

Hi, I am trying to work with the PGA2311  but my system is getting the power from single (USB interface) power supply of 5VDC, 

But In the VOUTR I am getting costant 600mV DC, no matter if there is signal in the VINR...

Any idea? I must work with dual power supply and connect the Va- to -5VDC?? even if my signal is p-p 300mV and riding on 2.5VDC?