I am wondering how do we make power budget when we have ADC and DAC in the schematic. The operating voltage of the ADC and DAC usually clearly written in the datasheets but how much the power supply current is the main question in this post.

As an example consider the following two.

ADC: AD7291BCPZ
DAC: MAX5541ESA

How much the maximum current these two chips can take from the power supply.

In the datasheet of ADC: AD7291BCPZ, Isink is mentioned as 6 mA but in the power requirement table, the current 3.5 mA is mentioned as "Normal Mode (Operational)". The datasheet also says "Input Current to Any Pin Except Supplies = +/-10 mA". I guess 10 mA is not the power supply current so should not be used in power budget. So, the current 3.5 mA is the power supply current to be used in power budget ?

In the datasheet of DAC: MAX5541ESA, the positive power supply current is 1.1 mA. The maximum current to any pin is mentioned as 50 mA. So, the power supply current 1.1 mA is the one that should be used in power budget ?

Link of datasheets
https://www.analog.com/media/en/technical-documentation/data-sheets/AD7291.pdf
https://www.analog.com/media/en/technical-documentation/data-sheets/max5541.pdf

 

For power budget, use the supply current as stated in the datasheets.
For AD7291, it is 3.5 mA.
For MAX5541, it is 1.1 mA.