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DG419L

Discussion in 'Electronic Design' started by ozzy, May 9, 2013.

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  1. ozzy

    ozzy Guest

    Hi all,


    The DG419L is a low voltage CMOS analog switch made by Vishay siliconix. Can V+ and V- be connected to VL and GND respectively, as from the data sheetit doesn't look immediately obvious....none of the app note circuits show them as connected. Hoping someone has already used the part, and come across this.


    Cheers,

    ozzy.
     
  2. Not used it, but yes.

    V- connected to GND is implied by the "single supply" specifications.

    VL to V+ is actually shown as an example on some of the graphs,
    e.g. Switching Threshold vs Supply Voltage datasheet p7.
     
  3. ozzy

    ozzy Guest

    Thanks for setting me on the right direction (John, Tim). I wasn't aware that VL was switching threshold, but have it connected to supply voltage on my schematic. This was the only thing I'd left unanswered, and thought it best to check before going to PCB.

    I was gonna go directly to Vishay but before they answer your questions, want a company name etc....I'm working on this! Besides I nearly always get top answers from people here.

    Cheers,


    Ozzy.
     
  4. Just a point of clarification - it is not the actual switching
    threshold, but it does control it. The idea is that in a mixed-signal
    system, it is connected to the "logic" supply rather than the "analog"
    supply. So you could have 3.3V logic operating the switches, but use
    +/-5V supplies to the analog circuits and to the V+/V- of the DG419L.

    So for a 3.3V VL the actual switching threshold is about 1V, as per the
    graph.

    (I have not actually used this chip, or read the datasheet
    exhaustively. But it is an extremely common arrangement for this sort of
    thing.)
     
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