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ADC08D1520QML-SP: Overdriven input

Mark Guastaferro
Genius 11425 points
Part Number: ADC08D1520QML-SP

Customer is using the ADC08D1520-SP and has a scenario where one of the inputs on one channel, (VINI+ or VINI- for example) could very infrequently see an overvoltage transient condition of 2.8V for < 1msec. This exceeds the max voltage rating for the pin of 2.5V. There is also an input current max rating of +/- 25mA. Note (3) under the table indicates the voltage can exceed VA if the current is limited under 25 mA.  

Can they exceed the absolute max rating of 2.5V with the 2.8V transient for short durations on the input without permanent damage as long as the current is limited under the 25mA absolute max rating? 

  • 0
    TI__Mastermind 18095 points

    Mark:

    My interpretation from the Absolute Maximum Ratings is that "Any Pin" refers to any arbitrary pin, but not specifically the input pins since it is called out specifically.  The "Any Pin" limit is -0.15 - (VA+0.15) or nominally -0.15 - 2.35V.  Note 3 also specifically refers to "any pin".  The current "limit" references the case where the voltage exceeds VA (or less than Gnd) but does not exceed the "any pin" absolute maximum voltage.

    For the input, I interpret the max as stated to be 2.5V without any consideration or adjustment for current.  As such, it is not recommended to exceed the maximum voltage of 2.5V.  Per note 2, there is a possibility of device damage if the absolute ratings are exceeded.

    --RJH