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Like LM358 but to rail?

Discussion in 'Electronic Design' started by Russell, Oct 31, 2004.

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  1. Russell

    Russell Guest

    Can someone please advise the lowest cost op amp with similar specs to
    the LM358 but with rail-to-rail outputs?

    I searched and searched but everything found so far, that is readily
    available, was far more expensive.

    Thank you,

    Russell
     
  2. Prithee, why do you need to go R2R?

    One can get close, though. Add a transistor to the output and one rail
    will be limited by the load current draw and the size of the transistor's
    collector resistor. The other rail will be limited by the transistor's
    saturation voltage.

    Run the feedback from the Q's collector to the op-amp's + input. You
    may need a small C in || with the feedback R for stability.
     
  3. Tim Shoppa

    Tim Shoppa Guest

    A pull-up on the LM358's output doesn't really make it rail-to-rail, but it
    does help in some uses.
    The LMC662 is a dual CMOS rail-to-rail op-amp of similar performance, but
    quite a bit more expensive than a LM358.

    Tim.
     
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