Differential input voltage of opamp ±0.8 V

Hi

In AD8022 datasheet has Differential Input Voltage  ±0.8 V at absolute maximum rating.

In design i provided the supply voltage as  +/-12V.

i used the amplifier as Voltage follower,inverting amplifier and active filter.

Inverting Amplifier and Filters are unity configuration mode only.

My single ended input signal of opamp is +4Vpeak to -4Vpeak with respect to ground.

Is the signal to be clamped by the internal diodes ?

Similarly i use the opamp of AD8032, ADA4898 .

It also have the differential voltage as +/-3.4V (AD8032) and +/-1.5V(ADA4898).

With regards,

selva

  • HI Selva,

    If you are using the AD8022 as an inverting amplifier as shown below, I don't think you gonna have a problem with the absolute maximum differential voltage. The differential voltage on the abs max rating refers to the difference of voltage between pin 2 and pin 3. As you could see, pin 3 is grounded and your negative feedback will try to make the voltage on pin 2 to be equal on pin 3 (Virtual short/ground) though in reality there is still a very small differential voltage existing between these input pins. Customers usually more concern with the input voltage range and output voltage range and I believe your circuit is within the range of these specs since you are using +/- 12 V supply. If you want to learn more about opamp, you can check this link: ADI - Analog Dialogue | Op Amp Applications Handbook

    Would you mind sharing your application and how do you come up with the AD8022 on this application?

    To double check, I am still  encouraging you to share your schematic here just to make sure that you don't have any obvious problem on your circuit. Or you can download the Simetrix which contain most of our amplifier products and you can simulate it by yourself to verify if it is working. Here is the link: ADIsimPE powered by SIMetrix/SIMPLIS | Design Center | Analog Devices

    Let me know if you need anything else.

    Best regards,

    Emman

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