• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 30 subscribers
  • Views 120 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TLV320AIC3106: ESD protection for microphone inputs

Dean Hofstetter
Expert 2565 points
Part Number: TLV320AIC3106

Tool/software:

The 3106 datasheet says it has ESD protection up to 1.9kV (or 1.5kV depending on which ESD module you use for testing).  I assume that applies to all pins on the device.  If I wanted to add more ESD protection to the MIC input lines, what device would you recommend?  I'm confused by selecting the correct TVS diode.  Uni-directional or Bi-directional?  There are plenty of TVS devices I can find that have working voltage of 3.3V or 5V, but their clamping voltage is way higher than the absolute maximum voltage of 3.9V.  I'm not even sure if a TVS diode is the best option.

I checked the 3106 EVM schematic, but unfortunately TI didn't add any ESD protection.  Does that imply that built in ESD protection for the 3106 is enough?  Any advice you can provide is appreciated.

Thanks, Dean

  • 0
    TI__Mastermind 31165 points

    Hi Dean,

    Typically yes the ESD protection should be enough but that really depends on your application and what kind of ESD you're at risk of. TI does have other ESD protection diode options aside from the TVS diodes here: https://www.ti.com/interface/diodes/esd-protection-diodes/overview.html

    It's hard for me to recommend a specific diode since it's very application dependent, but the protection internal to the device is reliable. There are also some other posts on E2E asking about similar ESD options for this family of devices (AIC310x). You might find some inspiration from there as well.

    Best regards,
    Jeff McPherson

  • 0 in reply to Jeff McPherson
    Expert 2565 points

    The problem I'm having is the working voltage for the TVS diode (3.3V in our application) is very close to the absolute maximum voltage for the 3106 (3.9V).  I can't find anything from TI (or any other manufacture) that has a low enough clamping voltage.  This leads me to believe I'm looking at the problem wrong.  Can you get your inside ESD experts to look at this post, or should I post on another TI forum (and if so, which one)?

    Thanks, Dean

  • +1 in reply to Dean Hofstetter
    TI__Mastermind 31165 points

    Hi Dean,

    I checked with some other colleagues and due to the low voltage limit, you might be better off relying on the protection already provided by the device.

    However if you want to get in touch with the ESD diodes team about some solutions, you can make a ticket referring to this part https://www.ti.com/product/ESDS311

    Best regards,
    Jeff McPherson