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ESD protection on INA146 inputs

g.spoerl
Prodigy 190 points
Other Parts Discussed in Thread: INA146

are there any suggestions how to protect the inputs of the INA 146 against ESD without degrading the common mode input range ?

  • 0
    TI__Mastermind 25805 points

    Hello Georg,

    What level of ESD protection are you looking for? 

  • 0 in reply to Pete%20Semig
    Prodigy 190 points

    According to DIN EN 61000-4-2: +/-4 kV contact, +/- 8 kV air gap

  • 0 in reply to g.spoerl
    TI__Mastermind 25805 points

    Hello Georg,

     

    Thank you for the additional information.  The direct answer to your question is that we have no information regarding the effects of external ESD protection schemes on the common-mode input range (or CMRR) of the INA146.

     

    That level of ESD protection is beyond what we usually deal with when it comes to difference amplifiers.  From what I understand, the 61000-4-2 specification is for system-level protection.  

     

    With respect to external system-level protection, I would suggest investigating devices that have extremely low leakage currents (with respect to the input bias current), minimal capacitance to ground, and well-matched impedances.  As noted in the INA146 PDS, a 12ohm mismatch between the two inputs can degrade the typical CMRR to 72dB (from 80dB).  

     

    Hope this helps.

  • 0 in reply to Pete%20Semig
    Prodigy 190 points

    Hello Pete,

    in our application the inputs of the INA146 are the analog input pins of our device. This should be nothing unusual for an inamp like the INA146. Physicaly the input pins are connector pins which have to withstand the ESD test of the whole system.

    This kind of use of an inamp should be in the range for what such a device was designed. It should be worth an application note how to survive that kind of usage.

    Best regards

     

    Georg