I have seen in one of our design that +5V(VDD) and -5V(VSS) are connected to AD7226. Does it work?
Sorry for letting this slip through the cracks...moving to Precision DAC community.
You need to supply VDD within the range of 11.4V to 16.5V to properly operate the device.
VSS = -5V should be fine.
What's the reference voltage?
Reference voltage is ~1V
You will need at least 2V on the reference pin.
Attached the circuit what we implemented for Reference input. It is working fine.