What is the limit on biasing the AGND pin on the AD5443? The pin description says you can bias it, but gives no limits.
The part's linearity falls off significantly after about 1.2 V, so generally we suggest this is the maximum bias voltage. Check TPCs on datasheet, figures 15 to 20, to give a better idea of this.
For a number of parts in the AD54xx family we do not have the biased mode.