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ADS131M08: How to protect ADS131M08 from surge current

Wendy Wang1
Genius 16920 points
Part Number: ADS131M08

Hi,

The picture below shows the actual layout of ADS131M08 in the customer's project. The ADC will be placed next to a 45kA 8/20 Surge current wire.

In the actual simulation process, our customer worries that the components inside the ADC will be damaged when the 45kA surge current is used, which will cause the ADC to not be used normally.

And could you please help with the questions?
1. Does the ADS131M08 has similar use cases or similar simulation models, which can verify that the ADS131M08 can work normally under such a surge?
2. Is this case, how should we determine whether the ADC is damaged?
3. Do we have a theoretical simulation model of ADS131M08 for simulation?

Best regards,

Wendy

  • 0
    TI__Guru 66226 points

    Hi Wendy,

    Thank you for your post.

    We do not have such simulation models which mimic the behavior of the ADS131M08 under a surge condition. Typically, a combination of clamping diodes and series current-limiting resistors are required to divert surge currents and to clamp the input voltages within the Absolute Maximum Ratings. If the part becomes damaged, you may notice a variety of incorrect behaviors, including full-scale or zero output codes, excessive supply currents, or an unresponsive digital interface.

    We do offer some basic input protection training as part of our Precision Labs training portal.

    Regards,