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TVS0500: TVS for Δ∑ ADC Input Noise Protection Circuit

Darren (FAE)
Expert 5483 points
Part Number: TVS0500

An IEC61000-4-4 Burst Noise test was performed on the cabling connecting to a board with a Δ∑ADC.
The cables connect to the board and PCB traces take the signals to the ADC, through an input CM / Diff filter.

Right now there is no protection; just the input filter.
For the noise testing, a waveform like below was observed.

Is there a TVS clamping diode we have that can respond in time to clamp this voltage?
Right now the consideration is to clamp the voltage to <14V or so; so we would need to respond in time to do this.

One consideration was the TVS0500...will this device respond in time to clamp to <14V?
The datasheet doesn't really get into the response time...

  • 0
    TI__Genius 16300 points

    Hi Darren,

    I checked this devices char data and the response time will meet your requirement. Once the device see's a voltage above Vbr, it will clamp the voltage to <14 V in the low nS range. The worst case clamping voltage is 9.5 V with a 43 A  IEC 61000-4-5 8/20 Surge. 

    Regards,

    Sebastian