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OPA859: Feedback resistor value

Part Number: OPA859


On the OPA859 datasheet, there are some recommended values for the feedback resistor. For gains less than 3V/V, Rf should be 150 Ohm. For gains of 4V/V and greater, Rf should be 453 Ohm. Why these values? Can't I use other resistor values for this feedback resistor?

Thank you in advance.

Best regards,

João Rego

  • Hi João,

    These values are provided as they will provide the best noise and distortion performance for the listed configuration. Other resistor values can be used, but will result in a degradation of the noise and harmonic distortion behavior shown in the graphs in section 7.6 of the datasheet.