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Input protection for ADG708BRUZ

I Have an application where the inputs to this mux are brought to a header for use with 0-5V voltage measurement feature. I'm supplying the device with 6V. I'm looking for ESD and overvoltage protection.

The 8 channel TVS device I'm looking at has a breakdown @5.7V but clamp at 10V. The ADG708BRUZ spec says VDD+0.3V max or 6.3V in my case. I'm current limiting the input with a series 100Kohm resistor.

Do I need to find a device that clamps below the 6.3V or will the 100Kohm current limiting suffice?

Or am I stuck pre buffering with a device with a higher input tolerance?

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  • Hi Mjn,

    Sorry for the delayed response.

    Based from my understanding of the statement above, you want to use the ADG708 with Vdd = 6V and the inputs (S1 to S8) will come from a TVS with 5.7V breakdown voltage and clamps at 10V. And in between TVS and ADG708 is a 100k ohm series resistor. Is that correct?

    Can you further explain the TVS condition? How does the breakdown voltage related to the clamping 10V?

    Also, can you share the next stage of the ADG708? Can you confirm what is the load?

    Thanks,

    May

Reply
  • Hi Mjn,

    Sorry for the delayed response.

    Based from my understanding of the statement above, you want to use the ADG708 with Vdd = 6V and the inputs (S1 to S8) will come from a TVS with 5.7V breakdown voltage and clamps at 10V. And in between TVS and ADG708 is a 100k ohm series resistor. Is that correct?

    Can you further explain the TVS condition? How does the breakdown voltage related to the clamping 10V?

    Also, can you share the next stage of the ADG708? Can you confirm what is the load?

    Thanks,

    May

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