Precision 5V reference

Discussion in 'The Projects Forum' started by prescott2006, Nov 14, 2010.

  1. prescott2006

    Thread Starter Active Member

    Nov 8, 2008
    72
    1
    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. thatoneguy

    AAC Fanatic!

    Feb 19, 2009
    6,357
    718
    The LM317 and LT1085 are adjustable voltage regulators, they would only be as accurate as the resistor (1% max, typ 20%)

    LT1027 is a Precision 5V Reference for +- 1/1000th volt. It will only supply 35 mA, however.

    If you are looking for a power supply type 5 Volt Regulator, the 75L05 will work for low current projects.

    For higher current projects/circuits, would need to know use and current draw required.
     
  3. Tahmid

    Active Member

    Jul 2, 2008
    344
    25
    Hi,
    Those two are adjustable regulators not references. If you want something very common and widely used, you can make it with a TL431.
    But, dedicated chips are RH1021-5, LT1027, MAX675, REF02, REF05, etc.

    Hope this helps.
    Tahmid.
     
  4. nuckollsr

    Member

    Dec 17, 2009
    16
    1
    Calibrated, off the shelf reference chips with stellar performance and a range of voltages are available from Digikey and others in the form of the LM4040 series devices.

    See: http://tinyurl.com/375ufnq

    These are simply precision zener diodes factory trimmed to very tight tolerances. Even the highest performing devices are only a few dollars.
     
  5. tom66

    Senior Member

    May 9, 2009
    2,613
    214
    LT6656 - precision +/-0.05%
    TL431B - precision +/- 0.5% (requires precision resistors as well.)
     
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