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OPA2227: OPA2227

Ahmed Sabry1
Intellectual 430 points
Part Number: OPA2227

Hello,

Please can I consider OPA2227 as a Single/Dual supply voltage? or it is for dual supply voltage only?

Thanks

Ahmed Sabry

  • 0
    TI__Guru* 93105 points

    Ahmed,

    The OPA2227 is most easily applied using the datasheet information as a dual supply (+/-) op amp. However, virtually any op amp that is most often powered by a dual supply (+/-) can be power by a single supply such as V+ and ground. That includes the OPA2227.

    For the OPA2227 the INPUT VOLTAGE RANGE VCM Range is (V–) +2 V to (V+) –2 V. If the +/-15 V supplies are changed to a single +30/0 V supply, VCM is now references to 0 V on the low end instead of -15 V, and +30 V instead of +15 V on the high end. A similar condition exists for the Voltage Output range which is specified as (V–) +2 V to (V+) – 2 V. The limits are referenced with respect to the single supply V- (0 V) and V+ (+30 V) voltage levels being used.

    See this TI, Burr-Brown Application Note on the subject:

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • 0 in reply to Thomas Kuehl
    Intellectual 430 points

    Thank you Thomas for your reply, Generally, Can I consider any OP Amp with dual supply voltage to be used with Single supply voltage? or it should be listed at datasheet?

  • 0 in reply to Ahmed Sabry1
    TI__Guru* 93105 points

    Hi Ahmed,

    Yes, I don't know of any exceptions where an op amp that most often uses a dual supply can't be configured to use a single supply. Just be careful to make sure that the input and output voltage ranges are properly referenced with regards to the supplies as I demonstrated in my previous response.

    If you apply a +/-15 V op amp to a +30 V/0 V single supply application and the output load resistor is connected to ground, the op amp output will only source current to ground. In the original +/-15 V application that same output can both sink and source current depending on the output polarity. But that would be the case as well for an op amp designated as a "single supply op amp."

    The single supply op amps are popular because they have been designed to have an input common-mode voltage range that often extends to, or slightly beyond the power supply rails. Their output voltage swing range comes very close to the supply rails as well. That usually makes them easier to apply than an op amp originally intended to use dual supplies. Many of latter do not have input and output voltage ranges that are specified to the supply rails.

    I hope this helps.

    Regards, Thomas

    Precision Amplifiers Applications Engineering

  • 0 in reply to Ahmed Sabry1
    TI__Genius 10850 points

    Hi Ahmed,

    We haven't heard from you in a while. We hope the issue was resolved. Closing this thread now. Reply to re-open if you have any additional questions.