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OPA1688 - 130mW in case of 128ohm

Hirotaka Matsumoto
Guru 27525 points
Other Parts Discussed in Thread: OPA1688

Hi all

Would you mind if we ask OPA1688?

Our customer would like to make the following condition using OPA1688.
-Load : 128ohm
-Output power : 130mW

Above condition, following values are obtained;
-31.6mArms / 43.5mAp
-Vrms=4.11V, Vp=5.81V, Vpp=11.62V,

As the result, is it possible to use 128ohm with 130mW?

Kind regards,

Hirotaka Matsumoto

  • 0
    Guru 27525 points

    Hi team

    We guess that your team is so busy, however could you give us the reply?

    Kind regards,

    Hirotaka Matsumoto

  • 0 in reply to Hirotaka Matsumoto
    TI__Guru 62035 points

    Hello Matsumoto-san,

    The OPA1688 output current specifications show that at temperatures near 125C that the maximum output current is close to +/-45mAp which is near the maximum required output current of 43.5mAp to achieve 130mW into a 128Ohm load.  For temperatures less than 85C, with a supply voltage greater than the required +/-5.81Vp output requirement by at least the limits shown in Figure 9, then the OPA1688 should be able to meet the requirements.  Low distortion performance is based on many application criteria beyond the op amp selection.  For more information on low distortion op amp design, please view the TI Precision Labs videos on op amp distortion.

  • 0 in reply to Collin Wells
    Guru 27525 points

    Collin san

    Thank you very much for your reply!
    OK, we got it.
    And, we will refer to TI Precision Labs.

    Kind regards,

    Hirotaka Matsumoto