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OPA859: Feedback resistor value

João Rego
Prodigy 216 points
Part Number: OPA859

Hi,

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

  • +1
    TI__Expert 6050 points

    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.

    Thanks,

    Nick