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OPA1679: Rail to Rail range under single supply operation

Adam Lock25
Prodigy 20 points
Part Number: OPA1679
Other Parts Discussed in Thread: OPA1678

I have a TINA TI sim running the OPA1679 under single supply operation off of a 5V supply. This simulation shows that the OPA1679 is capable of getting within ~60mV of 5V and Gnd. Can anyone confirm that the part is capable of this? I understand that any real part will not match the simulation 100%.

Thanks!

  • 0
    TI__Expert 7500 points
    Hi Adam,
    The TINA model should accurately model output swing vs. output current. A full list of the model simulated parameters is available in the header of OPA1678.cir, which can be opened in any text editor.

    Looking at the Output Voltage vs Output Current curves (figures 22 and 23) in the OPA1679 datasheet, the simulation appears to agree with characterization data, with the amplifier swinging very nearly to the supply rails with no load on the output. However, with a 2k load on the output, you could expect this to drop to about 800mV from the rails. You'll also need to be sure you don't violate the input common mode range. For a 5V single-supply configuration, this would be .5V to 3V of input common mode voltage. Outside this range, performance will be affected.
  • 0 in reply to Alex Davis
    Prodigy 20 points
    Thank you. With the data sheet stating that it could drive the output to within 800mV of the supply into 2k, I thought something wasn't correct.

    And the info about the header was very useful.

    - Adam