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OPA552/OPA551 for gains lower than 5

Gilles Malela
Prodigy 220 points
Other Parts Discussed in Thread: OPA551, OPA552

Hello , 

 I use the OPA551 and the OPA552 on my trial board.  I have  OPA551 in non inverting mode for a gain =2.  The supply voltage =+/-25V and the input signal =+/-4V.  If the input frequency is lower than 20KHz, my output signal = 2*input signa=+/-8V.  But when my input frequency is greater than 20KHz my output signal  is greater than +/-10V. I read some explanations about a gain lower than 5 but i didn't understand. Is this possible to have more explanations to choose the capacitance to avoid oscillations.

Thank you for your reading

Malela a student from France

  • 0
    TI__Mastermind 19086 points

    Hi Malela,

    The issue you are seeing with OPA552 or 551? In 551 case, you should not see any problems while operating less than gains 5.

    But in case of OPA552, it is optimised for using gains greater than 5 or more. but still you can use it for gains lower than 5.. Make sure that your noise gain remains greater than 5

    See the page number 13 of the data sheet of OPA552.

    Please explain....

    Also can you please send me the scope shot of the input and output waveform?

    With Regards,

    AKHILESH K