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Documents AD822: Phase reversal
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  • +Documents
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  • +General Information: FAQ
  • +AD59: FAQ
  • +AD202: 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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  • +EVAL-FW-BPDF1: FAQ
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  • +Precision Technology Learning Modules

AD822: Phase reversal

Q 

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?

 

A 

It is important to distinguish between over-voltage protection (i.e. the
ability of an IC to withstand input voltages greater than the power supply
voltage) and output phase reversal (a part specific phenomenon, where the
output is inverted as the input common mode approaches or exceeds the supplies).

The AD822 is not damaged when the input voltage exceeds 0.2V provided the input
current is limited to less than 10mA. However, the output may go into phase
reversal when the input exceeds the supplies.

In any case, the absolute maximum ratings supercede anything else in the
datasheet and should be respected at all times.

Consider the AD8512, AD8572, AD8552  as alternative rail to rail output, FET
input, single supply opamps.
  • ad822
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