TAS2555: IOVDD between 1.8 and 3.3V

Intellectual 1205 points

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Part Number: TAS2555

The datasheet specifies an IO voltage of 1.8V +/-10% and 3.3V +/-10% - do you know if there's any problem with operating it between those ranges? 
For example, operating at 2.1V. I see this voltage is fine for abs max, but I'm not sure if this affects any logic/performance inside the device.

Thanks
Nick