### Q

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?

### A

The AD822 PSRR specification in the datasheet…

FAQ

### Q

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 supply voltage in a proper way ?

### Q

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 once, during our system
proving, and the signal…

### 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

### 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 it be possible to get some infos on the background…

### Q

Is it allowed to have +-30V at the input, if the part is not powered.

### A

The AD822 cannot have +30V or -30V applied to either input when there is no
power on the supply pins. As a general rule, the absolute maximum current into
a pin should be limited…

### 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 …

### Q

would like to know more about the AD822’s input impedance. In the datasheet,
regarding an estimated variation of this impedance? What's the best way to

### Q

In the datasheet the AD822’s input impedance is a typical spec. Do you have any