SBAS572B May 2013 – March 2019 ADS8864
The device has two separate power supplies: AVDD and DVDD. The internal circuits of the device operate on AVDD; DVDD is used for the digital interface. AVDD and DVDD can be independently set to any value within the permissible range. During normal operation, if the voltage on the AVDD supply drops below the AVDD minimum specification, then TI recommends ramping the AVDD supply down to ≤ 0.7 V before power up. Also, during power-up, AVDD must monotonously rise to the desired operating voltage above the minimum AVDD specification.