AD7175-2 Unipolar Resolution

Hi,

I am looking to use the AD7175-2 with an external 5V reference to sample a unipolar differential signal (0 to 5V range); however I was concerned with possible resolution loss compared to bipolar operation (-2.5V to 2.5V range), as some of the other ADCs that I have been looking at will simply keep the FSR bipolar, thus leading to a 1 bit reduction in resolution. The datasheet does not mention any NFR performance degradation with respect to this issue, but I would like to confirm this. Many thanks.