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OPA211: OPA211 powered single-supply 3.3V?

Andreas Hauff
Prodigy 40 points
Part Number: OPA211

Is it possible or what are the drawbacks if the OPA211 is powered with a single 3.3V supply? First tests showed that it somehow works ...

Thank you!

  • 0
    TI__Guru* 77521 points

    Hi Andreas,

    The datasheet recommended to have minimum voltage of 4.5V as operating conditions in a single voltage supply. Even if the part works at 3.3V, it may not get the linear responses the op amp output. 

    Using 4.5V as the single rail power supply, the input signals are limited to very narrow range, which the common mode voltage in this part is rated between (V-)+2 and (V+)-1.4. In other words, the input signals are limited between 2V and 3.3V in order to operate linearly. 

    Best,

    Raymond