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Analog switch recommendation?

Discussion in 'Electronic Design' started by Chris Carlen, Aug 12, 2003.

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  1. Chris Carlen

    Chris Carlen Guest

    Greetings:

    I have to make a general purpose "switch closure" gadget. I will make
    one with a relay, which simply has a pair of contacts across a BNC
    connector. What in the heck is this for, you might wonder?

    In one case, it is used to reset a charge amp. Usually, the relay is
    fast enough, since it happens only a few times a second. But I want to
    make a solid state one, though that involves issues that a relay avoids,
    such as voltage ranges, polarities, on resistance, off resistance, etc.

    Perhaps a simple HC4066 will do here, but it appears to be able to work
    with positive signals only, which may limit it's usefulness and make it
    more liable to getting broken by scientists who tend to just connect
    cables to things and not think too much about what's inside.

    So the basic idea is a connector with a control input, TTL style, and
    one to three connectors wired to the "switch" so that at minimum, I will
    have a closure across one connector, but a little more fancy would be to
    have an SPDT switch one connector between two others.

    I would prefer to have an allowed voltage range of +/- 15V or so, up to
    30mA. I looked a little at Crydom SSRs, but they appear to force one to
    choose between switching AC or DC signals, and I'd rather have this be
    unconstrained.

    Any device recommendations?


    Thanks for input.


    Good day!

    --
    _______________________________________________________________________
    Christopher R. Carlen
    Principal Laser/Optical Technologist
    Sandia National Laboratories CA USA
    -- NOTE: Remove "BOGUS" from email address to reply.
     
  2. I agree, these are great devices.

    Also Chris might want to look at the analog devices ADG451 if he wants
    more than one switch.

    +/- 15V signals, 4 ohm, quad SPST.
     
  3. Chris Carlen

    Chris Carlen Guest



    Yes that's perfect!

    Thanks.

    --
    _______________________________________________________________________
    Christopher R. Carlen
    Principal Laser/Optical Technologist
    Sandia National Laboratories CA USA
    -- NOTE: Remove "BOGUS" from email address to reply.
     
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