ADG736 S overvoltage

The figure shows the electrical circuit of a controlled voltage divider. When resistors R1 and R3 are connected to resistor R5 (via S1A, S2A), resistors R2 and R4 are not connected. When the AC_IN voltage is 10 V, the analog signal voltage at the S1B and S2B terminals exceeds Vdd + 0.3. Overvoltage protection triggered. In this case, the voltage across the resistor R5 does not correspond to the calculated value. If the AC_IN voltage level does not trigger the internal protection, the voltage across the resistor R5 is correct. My question is: is it possible to use some inputs of an analog switch in case of overvoltage (with current limitation) on other inputs?

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  • +1
    •  Analog Employees 
    on Sep 13, 2019 1:08 PM

    Hi,

    The ADG736 has overvoltage diodes to VDD and VSS. When an overvoltage occurs the diode becomes forward biased and current begins following from the input signal to the supplies. You would need to take into account how the current draw from your signal and into the supply affects your overall system.

    Regards,

    Stephen

Reply
  • +1
    •  Analog Employees 
    on Sep 13, 2019 1:08 PM

    Hi,

    The ADG736 has overvoltage diodes to VDD and VSS. When an overvoltage occurs the diode becomes forward biased and current begins following from the input signal to the supplies. You would need to take into account how the current draw from your signal and into the supply affects your overall system.

    Regards,

    Stephen

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