AD7190 Voltage Reference

If using the ADR421 voltage reference with the AD7190, what is the recommended value or range of values for a decoupling capacitor?  Also, how is the input impedance of the reference inputs derived?

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  • Hi Johnny,

    Thank you very much for the response.  In some applications, I won't be using an ADR431 type reference, so for the input impedance, I am interested in the frequency dependent nature.  The data sheet mentions that the input impedance is dynamic and that certain R-C combinations on the input can cause DC errors. I would like to better understand this so that I can derive acceptable source impedances.

    Thanks,

    Steve

Reply
  • Hi Johnny,

    Thank you very much for the response.  In some applications, I won't be using an ADR431 type reference, so for the input impedance, I am interested in the frequency dependent nature.  The data sheet mentions that the input impedance is dynamic and that certain R-C combinations on the input can cause DC errors. I would like to better understand this so that I can derive acceptable source impedances.

    Thanks,

    Steve

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