Hi Team,
Can you have a look at the following customer inquiry?
We are implementing the ADC chip ADS8688AIDBTR on our system and we would like to use its DVDD supply at 5V instead of nominal 3V3 level.
On the datasheet, it claims on the Recomended Operating Conditions chapter that the maximum DVDD should be on the AVDD level. On the other hand, the Absolute Maximum Ratings section shows that both supplies (AVDD and DVDD) can go up to 7V (independently) without destroying the chip.
Firstly, I would like to ask you if it is okay to use both AVDD and DVDD supplies at 5V and if there are some possible implications on making DVDD beyond its nominal 3V3 level, but at AVDD level.
On our system, we are implementing AVDD with a constant 4.9V voltage (provided by a LDO). On the DVDD side, we would like to have 5V coming from a point of load circuit, so it would be slightly more noisy, so the voltage might reach 5.2V for a short time.
Would it be a potential issue for the ADC performance since DVDD is slightly higher than AVDD (AVDD = 4.9V and DVDD = 5.2V)? Is it possible to damage the ADC chip under the mentioned circunstances?
Thank you,
Franz
