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Improved TL082 op amp?

Discussion in 'Electronic Design' started by Albert, Mar 26, 2005.

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  1. Albert

    Albert Guest

    need a low noise op amp similar to the TL082. It must have similar
    gain, but I need lower power consumption, lower noise and a single
    supply chip (low Vcc preferred).
    It must be available in a DIP package.

    Any suggestions?

    TIA

    A
     
  2. artie

    artie Guest

    OPA2134
     
  3. Pooh Bear

    Pooh Bear Guest

    What do you mean by single supply ? An 082 ( in fact any op-amp ) can be
    used with a single supply with proper biasing.

    Cost will be a *big* factor in the answer. Can you live with an esoteric
    price tag ? How much lower noise do you want ? Is it for audio ?

    Generally, low voltage operation is rarely seen in low noise op-amps.
    What supply do you want to use ?


    Graham
     
  4. Albert

    Albert Guest

    Thanks Artie,

    Can't use it, it uses 5 ma per channel, which is twice as much as the
    TL082.

    Still looking.

    A
     
  5. Pooh Bear

    Pooh Bear Guest

    Yeah well you didn't specify current consumption.

    That's why your question's likely to throw up any number of unsuitable
    answers.

    Please go back and *define* the parameters that are most important to you
    instead of asking half-arsed questions..


    Graham
     
  6. Tim Shoppa

    Tim Shoppa Guest

    need a low noise op amp similar to the TL082. It must have similar
    TLV2471A (single)/TLV2472A (dual) is a nice jellybean for 3.3V or 5V
    use. Slightly lower noise than a TL08x, about one-fourth the quiescent
    power. Not really cheap.

    There's a lot of 3.3V/5V op-amps out there these days, most are only in
    surface mount, but the TLV247x are available in DIP too.

    Tim.
     
  7. Albert

    Albert Guest

    My original post said 'lower power'. The op amp you suggested uses 2-3
    times MORE power.

    While my original post wasn't precise, I don't know how you can be
    critical of me.

    I wish you luck.
     
  8. Albert

    Albert Guest

    Looks like a winner, many thanks.

    I can handle the price tag, the lower supply voltage and lower Vcc
    allow me to use a smaller battery in the portable version!

    I had picked out an opa2704, which ran on higher voltage, but used
    less power. But, I like your suggestion much more.

    Again, thanks.

    A

    ..
     
  9. Pooh Bear

    Pooh Bear Guest

    I didn't suggest anything actually simply because you hadn't defined your
    requiremnts,

    Why not read my other post.
    The devil is in the detail. Ppl are forever coming here asking ' what should I
    use ' but rarely define their requirements properly and get answers that
    reflect that.

    As I said in my other post. Low noise op-amps are rarely low power. You can
    reduce power by reducing the volts of course. But you won't answer that
    question either.

    Graham
     
  10. Pooh Bear

    Pooh Bear Guest

    Only about 1.5 dB quieter and 1/10th the slew rate !

    You just can't win.


    Graham
     
  11. Tim Shoppa

    Tim Shoppa Guest

    Only about 1.5 dB quieter and 1/10th the slew rate !

    He never said "fast" :).

    The TLV245x, 246x, and 277x round out the line for lower power, higher
    current out, higher slew rate. The 247x is the middle-of-the-road
    choice.
    Depends on who you're racing against :).

    Tim.
     
  12. Mac

    Mac Guest

    He did specify the power. He said "less than the TL082." His post wasn't
    NEARLY as vague as many that appear hear. I think you are punishing him
    for the sins of others. ;-)

    --Mac
     
  13. Yeah, well, yes he did:

    Granted, "power" and "current" aren't the same thing, but still...

    Cheers!
    Rich
     
  14. Hi,

    | > need a low noise op amp similar to the TL082. It must have similar
    | > gain, but I need lower power consumption, lower noise and a single
    | > supply chip (low Vcc preferred).
    | > It must be available in a DIP package.

    there are nice parametrical search functions on almost all
    manufacturers websites. Why don't you use this? I preder starting @
    ti.com, continuing by analog.com If i didn't find it there I try
    national and linear. For doing this I need not more tham one hour and
    have a nice overview whether my wishes are reasonable realizable or not.

    Martin
     
  15. James Beck

    James Beck Guest

    Look at what Microchip has.

    www.microchip.com

    If a Vcc of 5.5V or less is no problem they have a few to choose from.

    Jim
     
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