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AMC1311: Analog Input

Brian Wang0928
Genius 14900 points

Part Number: AMC1311

Tool/software:

What if the Analog input voltage up to 15V,dc value. Would it damage the device?

It looks there's a Zener diode of 2.51V at INPUT pin. So when Input voltage up to 15V, the Zener diode will be active and causing the power losses and heating the device, correct?

Regards

Brian

  • 0
    TI__Guru 57192 points

    Hi Brian,

    Possibly, this voltage would violate the absolute maximum ratings. Yes there are internal ESD protection diodes but they should not be relied on to clamp voltages outside the absolute maximum ratings. 

    For optimal protection, I recommend adding series input resistance to limit the input current to be 100uA or less. Then an external protection diode from the input to the high side supply. 

  • 0 in reply to Alexander Smith
    TI__Genius 14900 points

    Thanks.

    A quick question here.

    When 3.8V supply is connected to the Input pin of the AMC1311, will device be damaged? The abs.max spec defines the max. input rating is VDD1 + 0.5V. 

    It looks the 3.8V put on the internal Zener diode without impedance. 

    Condition: VDD1 = 3.3V. 

    Regards

    Brian

  • 0 in reply to Brian Wang0928
    TI__Guru 57192 points

    Voltages beyond the absolute maximum ratings will damage the device. Of course, higher voltages would result in damage in a shorter period of time. 

    Likely the device could withstand application of the exact absolute maximum ratings for some time - but it is best not to rely on this in practice.