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Documents AD822: Output voltage exceeds rails
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  • +Documents
  • Tags List Amplifiers
  • +General Information: FAQ
  • +AD59: FAQ
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  • -AD822: FAQ
    • AD822: Overvoltage issue
    • AD822's Input Impedance - best way to measure and variation from typical spec?
    • AD822 Input Impedance - variation from typical spec and how to measure it?
    • AD822: Output voltage exceeds rails
    • AD822: Phase reversal
    • ad822: Phase reversal (1)
    • AD822: PSRR
    • AD822:Asymmetrical supplies
    • AD822: Input Overvoltage protection
  • +AD823: FAQ
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  • +Precision Technology Learning Modules

AD822: Output voltage exceeds rails

Q 

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). Besides, in this situation, the output could
be connected through a pull-up resistor of about ten kilohms to a voltage
source higher than +15V. How does the op-amp behave in this conditions and what
is the limit of the value of the voltage applied through the 10kOhm resistor to
the output of the op-amp so not to damage the op-amp?

 

A 

The output of an op-amp should not go outside its supply rails as it may
destroy the device. If the load resistance is such that the pull-up resistor
current flows in the load and does not cause the terminal to rise above the
op-amp supply then the voltage on the resistor is unimportant. If you wish the
OP to rise above the rail - do not do it!

It would be sensible to use a schottky diode clamp to prevent the output rising
too high by accident.
  • ad822
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