AD8221: FAQ

  • Article

    AD8221 Input Bias Current

    Question How did you come up with the 100GOhm specification for input bias current for AD8221? Answer Essentially, it is the change in voltage at the input divided by the change in input bias current…
  • Article

    AD8221 output impedance

    Question Could you please provide me data on the resistance of the output path of the AD8221? Answer The output resistance is quite low at dc and low frequencies. Approximately 0.1 ohms until the short…
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    AD8221: Driving capacitive loads

    Question Can you say advise about stability of the AD8221 at capacitive loads. Which capacitive load is acceptable? Answer The settling time plots in the datasheet are all done with a 100pF load, and…
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    AD8221: Operating at a constant gain over a larger temperature range

    Question I am trying to make an accurate system stable over a large Temperature range (-60°C - 110°C). What type of gain setting resistor should I use to keep a constant gain. Answer The AD8221 includes…
  • Article

    IN-AMP and DIFFAMP: CMRR Test Conditions

    Q Why for in-amps, CMRR testing will use 1kOhm unbalanced signal source, but differential amp don’t? How you can get the 1kOhm unbalanced signal source? Is it normal signal source specs, e.g. some models…
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    INAMP_CMRR in single power supply and dual power supplies

    Q I wanted to know whether the CMRR will be influenced by this different conditions? Take AD8221 for example. Case 1: supply the +5V single supply to it, the input signal will be Voff=2.5V, and the AC…

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