Is this a correct observation? I am trying to implement AC-excited +5/-5 load cell. I reduced the AVDD and AGND using op-amps as suggested, then run +5/-5 to the load cell through analog switches. The reference voltage comes back to the AD7730 split with the same resistor combination used for AVDD/AGND (0.1% precision, just to be sure).
I made a mistake in the schematic in that the connection of the ACX/!ACX lines went to an unconnected pin of the analog switches, and that was for the good. I was flabbergasted not to see 0V/5V on these lines, but instead -2.5V and +2.5V. This would have blown the switches.
Is something else wrong or are the ACX/!ACX lines actually referenced to AGND and NOT DGND as implied by the data sheet?