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Need analog switch

Discussion in 'Electronic Design' started by Luhan, Apr 2, 2006.

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  1. Luhan

    Luhan Guest

    I'm working on a remote switchbox for s-video for my home entertainment
    system.

    I need some analog switches with resistance of 20 ohms or less
    (assuming s-video is feeding 50 ohm loads). 4 (dual) inputs to one
    (dual) output.

    Handy if available in DIP, but I can handle SOIC. Cheap is also good.

    Thanks,
    Luhan
     
  2. Did it occur to you to have a look at the
    manufacturers webpages ? What did you come
    up with ?

    Rene
     
  3. Luhan

    Luhan Guest

    Yes, mostly clones of cd4051's with about 80 ohms. Some nifty ones
    from Analog Devices with no prices quotes below 1000 each. Some
    really pricey ones from DigiKey.

    I can't be the first guy who would like a 4051 8x1 analog gate with
    better resistance specs.

    Luhan
     
  4. Fred Bloggs

    Fred Bloggs Guest

    http://www.web-ee.com/Schematics/VSwitch/vswitch.htm and it looks like
    75 ohms.
     
  5. I'd go for buffered type switches, it means you can properly terminate
    the video sources, rather than depend on the intrinsic on resistance
    of the switches. Maxim had a reasonable range, last time I looked, a
    year or so ago. BTW video is 75 ohm not 50

    Cheap... well if the box lasts for 5 years, does it matter if the mux
    is 10€ or 3€?


    martin
     
  6. There are parts such as the Fairchild FSAV430QSCX 4-channel 1-of-2
    switch. About USD 1.50 in 100's. 7 ohms max, and rated for high-res
    video frequencies.
     
  7. Luhan

    Luhan Guest

  8. Luhan

    Luhan Guest

    Only because I tend to do a bulk purchase when I find a generally
    useful part. 10 at least, usually 25 to 50.

    Luhan
     
  9. Luhan wrote...
    There's a rather large set of 74hc4051 parts from various
    manufacturers with dramatically-lower Ron specs. Yes, it's
    true they have lower maximum supply voltages, but that's the
    tradeoff we have for our MOS and CMOS integrated circuits.
     
  10. Donald

    Donald Guest

  11. Luhan

    Luhan Guest

  12. Donald

    Donald Guest

  13. Deefoo

    Deefoo Guest

    I like the HA4314 4-to-1 video mux which exists also as the AD8184. It is
    not expensive and both can be gotten from Digikey and Radiospares.

    --DF
     
  14. Maxim has some low resistance Switches.
    Then there are a few from Siliconix,

    Another option would be tristate output amplifiers,
    of which BurrBrown and Linear Tech has some.
    Have a look at the LT1203, a 150MHz video multiplexer.

    Rene
     
  15. Fred Bloggs

    Fred Bloggs Guest

  16. Siong Boon

    Siong Boon Guest

    you can try these analog switch
    ADG451, ADG452, ADG511.
    I brought low qty 2pcs for $18/ea.

    Very low resistance and easy to use.

    --
    Best Regards,
    Lim Siong Boon


    www.siongboon.com
     
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