My customer would like to run the AD8021 op amp from a single +12V supply. It seems possible but there are a few exerts in the datasheet that are making us wonder.
AD8021 can be operated using single +12V supply. Operational amplifiers don't really know where the ground potential is, since they don't have ground pins. They just look what potential their supply pins with respect to each other. For your case, operating at single +12V supply is practically the same as operating the op amp at dual +/-6V
One thing you should take into consideration though is that the input common-mode voltage range of the amplifier is normally the difference of the supply voltage and the input headroom. The amplifier must operate within this input range to work properly. To determine the input range, we need to know the input headroom required by the amplifier. Let's take a look at the input characteristics at +/-12V supply.
The input goes only to -11.1V to 11.6V for a supply +/-12V. This means that the amplifier requires a headroom of 0.9V from the negative supply and 0.4V from the positive supply. This headroom is approximately constant across the operating voltage range, therefore it should be the same when operating at +Vs=+12V and -Vs=0V. Thus, at single supply +12V, the input common-mode range of the amplifier is 0.9V to 11.6V.
I hope this helps. Please let us know if you have further questions.
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