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Precision 5V reference

Discussion in 'Datasheets, Manuals and Component Identification' started by prescott2006, Nov 15, 2010.

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  1. prescott2006

    prescott2006

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    Oct 9, 2010
    Anyone can suggest a very precise and constant 5V reference? I Google and see many are recommend LT1085 and LM317? Which one is better? Any better recommendation?
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,449
    2,809
    Jan 21, 2010
    Define precise (over input voltage, time, load, and temperature?) Is noise a consideration?

    The LM317 isn't a precision regulator.

    Do you really want a 5V reference, or a 5V supply? (i.e. what current are you needing)?
     
  3. prescott2006

    prescott2006

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    Oct 9, 2010
    I want to have a constant 5V source in my circuit. Like I supply 12 V, then I will get a very precise 5V voltage. Precise in term of the 5V will as constant as possible no matter how is the load and the fluctuation of the input voltage.
     
  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    OK, sounds like you simply need a regulator.

    Google 7805
     
  5. prescott2006

    prescott2006

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    Oct 9, 2010
    But is it 7805 output reliable? Won't it fluctuate too much from 5V?
     
  6. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,449
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    Jan 21, 2010
    You have yet to define what limits you have.

    From your explanation it sounds like all you need is a 5V regulator.

    If it's any more complex we need details.

    "As constant as possible" is NOT sufficient (it is pretty meaningless)

    Have a look at the datasheet for the 7805 and tell us if there are any of its specs that fall outside your required parameters, and by how much.
     
  7. bean

    bean

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    Oct 21, 2010
  8. barathbushan

    barathbushan

    223
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    Sep 26, 2009

    That's link is not really helpful
     
    Last edited by a moderator: Dec 8, 2010
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