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Analog switch input voltage

Discussion in 'Electronic Basics' started by terry, Jul 17, 2004.

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  1. terry

    terry Guest

    Hi,

    Do anyone know whether I could input 100V to a CD4052 analog switch
    channel which is suppled by 5V? If not, any other analog switch
    channel component in the market could do the job?

    Thanks!
     
  2. Fred Bartoli

    Fred Bartoli Guest

    Yes you could, but it certainly won't survive.

    Some switches are designed to withstand fault voltages up to about 40V
    *fault* voltage, at the expense of a higher on resistance, but they won't
    pass signals beyond their supply rails.
    Vishay, Maxim have some and probably all other switches manufacturers have
    too and those will always cost you much more than your initial 4052.

    What's important to know is : do you have to pass 100V signals or is the
    100V a fault condition ?

    Anyway, if you can accept a finite input impedance, the way to cope with
    high input voltages is to switch between different resistors as the input
    resistor in an opamp inverter amplifier if you need very high linearity, or
    as the first resistor of a divider followed by a buffered in more standard
    cases.

    Thanks,
    Fred.
     
  3. John Larkin

    John Larkin Guest

    I all you want to do is measure the voltage, divide it down first. If
    you really need to switch 100 volts, use one of those neat little
    opto-mos solid-state relays.

    John
     
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