The DACx1001 do not require any power-supply sequence. However, the power supplies to the AVDD pin must be capable of providing 30-mA of current if VSS ramps before AVDD. This current is derived from the AVDD pin, and flows out of the VSS pin. This condition is transient, and the device stops consuming this current when the power supplies are ramped up. To avoid this condition, make sure to ramp AVDD before VSS.