Choosing an op amp

Discussion in 'The Projects Forum' started by edvard_m, Feb 16, 2010.

  1. edvard_m

    Thread Starter New Member

    Dec 1, 2009
    6
    0
    Hi everyone,

    I have a 1mA DC current that I am going to run through a 100ohm resistor to convert to a voltage and send to input of an opamp. I need low noise so I can detect at least a 10uA change in the DC current. I searched digi-key and there are so many that seem to work for my application. Does anyone have any suggestions for specific surface mount parts to look into that are low noise with good dc characteristics? Also, I need it to run from a single voltage supply of 3V or less.

    Thanks,
    ed
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Have a look at this one...
    Datasheet: http://cds.linear.com/docs/Datasheet/20545fc.pdf
    http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1027,P2439
    You really haven't given a lot of detail about your application, but this opamp has very low drift and only 3uV offset maximum over op temp range, low power, low noise; and it fits your 3v single-supply and SMT/SMD requirement as well.
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,536
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