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INA310A: Question for INA310A2 application

Ryan Cao
Prodigy 10 points
Part Number: INA310A

May I know a question about the application of INA310A2 for the customer?

If “In+” is disconnected and “In-” is connected, the “OUT” is low.

If “In+” is connected and “In-” is disconnected, the “OUT” is high.

If “In+” and “In-” are both disconnected, the “OUT” is low.

The results above are simulated in Tina. Could you tell me if my conclusion is correct?

  • 0
    TI__Mastermind 37635 points

    您好

    已经收到了您的案例，调查需要些时间，感谢您的耐心等待

  • 0 回复 Daniel
    TI__Mastermind 37640 points

    您好，   

        INA310A 在输入端具有一个电荷泵，，使输入端能够低于接地电位。

        当IN+ 和 IN- 悬空（floating)状态，芯片无法提供正确的输入偏置电流（IB）来使芯片按预期工作。

        参考相关案例，输入悬空时，输入端表现的电压为负，具体您可以测试一下。     

         当放大器的输入处于悬空（floating)状态时，建议您使用下游电路屏蔽输出，即在您有已知输入之前，忽略放大器的输出。