ADA4522 feedback resistance

  • I used the ADI tool to automatically generate the filter circuit

  • Is there a problem with this circuit?

    • Does ADA4522 need to increase the feedback resistance?

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  • +1
    •  Analog Employees 
    •  Super User 
    on May 4, 2020 2:58 AM

    Hi seekyong,

    When you ask about "increasing the ADA4522 feedback resistance", are you concerned about output current or output voltage swing with your lowest feedack (i.e. 2.94kohm)?
    I think you won't have any issues with such values as Figure 20, and Figure 23 plots show that ~5mA output current still allows you to swing close to less than 1V from either supply rail.

    Or may be you are referring to something else in the datasheet about the feedback resistor having to be large, if you point it to me?

    Regards,

    Hooman

Reply
  • +1
    •  Analog Employees 
    •  Super User 
    on May 4, 2020 2:58 AM

    Hi seekyong,

    When you ask about "increasing the ADA4522 feedback resistance", are you concerned about output current or output voltage swing with your lowest feedack (i.e. 2.94kohm)?
    I think you won't have any issues with such values as Figure 20, and Figure 23 plots show that ~5mA output current still allows you to swing close to less than 1V from either supply rail.

    Or may be you are referring to something else in the datasheet about the feedback resistor having to be large, if you point it to me?

    Regards,

    Hooman

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