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need simple sample and hold chip

Discussion in 'Electronic Design' started by [email protected], Apr 6, 2007.

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  1. Guest

    I'm looking for the switch or gate for a sample and hold.
    requirements: +/- 5V input , TTL control referenced to analog ground,
    dip or soic package. 4066 or 4053 need not apply. bandwidth is 20
    khz and sampling rate is undersampling,ie 100 to 500 hz.

    any candidates?

    thanks, Steve Roberts
     
  2. whit3rd

    whit3rd Guest

    One possibility is a programmable-current (transconductance)
    op amp. LM13700 has two sections, first section can be
    the follower, second can be the buffer, stick a capacitor
    in between (or onto the buffer negative feedback) and
    just gate the program current on the follower to HOLD.

    Integrated solutions include LF398 (but it seems like overkill here).
     
  3. John  Larkin

    John Larkin Guest

    Why not 4066 or HC version?

    John
     
  4. Maxim has appnote 638, showing specs of analog switches. Lots of them
    are for +/- supply with separate logic ground.

    http://www.maxim-ic.com/appnotes.cfm/appnote_number/638
    Selecting the Right CMOS Analog Switch - Maxim/Dallas
     
  5. MooseFET

    MooseFET Guest

    The DG411/412/413 are ok parts. You didn't state why you can't use
    the 405x parts.


    The DGxxx parts are analog switches they started out IIRC as Siliconix
    parts. Today many people make them. If you google on: DG411
    Datasheet
    You are likely to find the makers. Vishay would be the most likely
    source today. IIRC Maxim has published a datasheet for them so they
    may also make them.
     
  6. Mark Zenier

    Mark Zenier Guest

    LF398 ?

    Mark Zenier
    Googleproofaddress(account:mzenier provider:eskimo domain:com)
     
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