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???
07/11/05 09:12
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#96987 - Just don't do it!
Responding to: ???'s previous message
Sun Din said:
My question is, What is this duration that they speak off. Is there a quantified value.

It is not a defined time - just don't do it!

Absolute Maximum limits are NOT to be used as operating conditions!

My question stems from the fact that I am using an ADC with a absolute min reading on the analouge pin of -0.3V, but I expect anything from -0.6V to -1.1V at times.


Again, Absolute Maximum limits are NOT to be used as operating conditions!

There are signal protecters out there that switches the signal off after a 10ns delay on the detection of fault conditions. Is the ADC safe if -0.6V to -1.1V is present on the input pin for 10ns?

Don't bank on it!

You might be lucky, you might not.

The datasheet tells you what the manuafacturer guarantees - anything else is totally unguaranteed and, therefore, not to be relied upon.

What in your opinion, is the maximum duration that can be tollereated.

You are basically saying, "If I abuse this part, but just a little, is that OK?"
Doesn't sound like a good design approach to me!

Sounds like what you actually need is either:
  • An input stage to offset your signal so that it's guaranteed to be within the ADC's specified Operating range, or
  • A different ADC (bipolar input?) that is properly specified for the operating conditions of your application.



  • List of 6 messages in thread
    TopicAuthorDate
    Question - Absolute Max Ratings            01/01/70 00:00      
       Just don't do it!            01/01/70 00:00      
       not "to" but "exceeding"            01/01/70 00:00      
       Extended periods            01/01/70 00:00      
       Extended or not...            01/01/70 00:00      
          Thank you all            01/01/70 00:00      

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