High Precision OpAmp

Discussion in 'The Projects Forum' started by Tyler Bradbury, May 5, 2015.

  1. Tyler Bradbury

    Thread Starter New Member

    Mar 18, 2015
    13
    0
    I am creating a differential amplifier that deals with inputs ranging from 0-50mV. I have been using an LM324N, but when I get to <100mV, the noise interferes too much (I have decoupling caps and have terminated the unused opamps). I need a high precision opamp that can deal with <100mV, but have not dealt with them before. Is OPA277P an acceptable opamp that will fit my spec? I am providing +-15V to +-Vcc.
     
  2. OBW0549

    Well-Known Member

    Mar 2, 2015
    1,316
    888
    The OPA277 is a good opamp for precision work. The Linear Technology, Inc. LT1793 is good, too, especially if you are dealing with very high source impedances and need extremely low input bias current. The LT1128, on the other hand, is excellent when working with low-impedance input sources and has extremely low input voltage noise.
     
  3. Kermit2

    AAC Fanatic!

    Feb 5, 2010
    3,791
    945
  4. upand_at_them

    Active Member

    May 15, 2010
    246
    29
    NE5532?
     
  5. AnalogKid

    Distinguished Member

    Aug 1, 2013
    4,542
    1,251
    For your LM324 circuit, are you using the 2-opamp or 3-opamp implementation?

    The 5532 is an old and dear friend, but it isn't the best choice for DC precision. This is where Analog Devices and Burr-Brown (now TI) shine. Relatively new kid Linear Tech also is strong in this area. Not a big Maxim fan.

    Also, consider an integrated instrumentation amplifier. A bit more money, but you get precision-matched, laser-trimmed, temperature-tracking resistors built-in.

    ak
     
  6. bushrat

    Member

    Nov 29, 2014
    97
    22
    I have a lot of new OPA627BM, each tested to have offset of approximately around +100 uV. If you are interested, let me know and I'll send them to you.
     
Loading...