AD822: FAQ

  • Article

    AD822 Input Impedance - variation from typical spec and how to measure it?

    Question would like to know more about the AD822’s input impedance. In the datasheet, the AD822’s input impedance is a typical spec, do you have any more information regarding an estimated variation…
  • Article

    AD822's Input Impedance - best way to measure and variation from typical spec?

    Question In the datasheet the AD822’s input impedance is a typical spec. Do you have any more information regarding an estimated variation of this impedance? What's the best way to measure this parameter…
  • Article

    AD822: Input Overvoltage protection

    Question Is it allowed to have +-30V at the input, if the part is not powered. Answer The AD822 cannot have +30V or -30V applied to either input when there is no power on the supply pins. As a general…
  • Article

    AD822: Output voltage exceeds rails

    Question In an amplification circuit with AD822 supplied with +15V/-15V, there could be an operating condition in which the output of the op-amp is saturated to +15V (Vin is so high that Vin*G>15V…
  • Article

    AD822: Overvoltage issue

    Question The problem I have is as follows: I am having to apply a signal of approximately +/-1 volt to the -ve input of one amplifier in an AD822, while the device is unpowered. This event occurs only…
  • Article

    AD822: Phase reversal

    Question Tha datasheet states that the opamp AD822 do not phase invert the output signal when the input signal exceeds the supply voltage, but it does. How can that be? Answer It is important to distinguish…
  • Article

    ad822: Phase reversal (1)

    Q A customer is reporting a behavior of the AD822 as follows: If an input gets a voltage level that is above the Vdd, the output is going low instead of staying at Vdd potential. ° Would…
  • Article

    AD822: PSRR

    Question I would like to get support regarding the power supply rejection value of the component AD822. The data given in the tables are referred to the input or the output of the opamp? Answer…
  • Article

    AD822:Asymmetrical supplies

    Question In my application the AD822 gets dual supply, but not symmetrical: V+ = + 24V and V-= -5V. The AD822 drives a load of 4 kOhm against analogue ground. Does work the AD822 with the unsymmetrical…

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