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Why the supply of ADCs is mostly 1.8V or 3.3V ?

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firsttimedesigning

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ok so for the power supply of an ADC most of them are 3.3 and 1.8V. but why? why not 1.9V? why not 2.0V? why 1.8V? i dont understand.

I am trying to design a comparator for SA-ADC. if my Vdd is 1.8V and Vss = 0 = gnd, how is the minimum input common mode range be enough? I mean I need something that can be as low as -0.5V assuming the input range if 1V, from 0 to 1V.
 

ADC again....

it is based on the technology we use... the supply is decided based on what the voltage range is decided based on various considerations like how much the technology can withstand etc....
 

ADC again....

To: firsttimedesigning
What circuit you are using for your comparator? can share here? i am doing it too.
 

Re: ADC again....

One of the batteries normally used in portable devices creates 0.9V. That is why you see so many times 1.8V (2 batteries in series), 2.7 (3 of them).

Don't ask me why 3.3, because that one I don't know :oops:
 

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