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ADA4075 Differential Input Voltage


I want to use ADA4075 for a differential input that could have a maximum of 10V differential voltage.

In the datasheet, I see the absolute maximum rating for Differential Input Voltage is ±1.2 V

What does this mean? The Inputs should have a difference not more than  ±1.2 V? how can I consider it in my design? The inputs are ±5V.

Thanks in advance.



The input could have a maximum of 10V differential voltage.
[edited by: mehran at 7:38 AM (GMT 0) on 29 Apr 2020]

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  • Hi mehran,

    It should be clear that you are using a differential configuration, here the differential input voltage of the circuit is not equal to the voltage between the inputs of the op amp and can significantly exceed it. Due to the action of negative feedback, the voltage between the inputs of the op amp is close to zero.

    If I understand correctly, you are using a supply voltage lower than +/- 15 V and you are interested in the allowable range of common-mode input voltages. For the + / - 5 V case, you can extract useful information from this graph

    Common-mode voltage can be + / - 3 V. This is 2 volts lower than the supply voltage, and in the case of a supply voltage of + / - 15 V, the common-mode voltage is 2.5 V lower. Focus on these numbers.

    Regards,

    Kirill

  • Thank you, Kirill.
    Now it is clear for me and It is really useful.Thumbsup