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LM387 equivalent?

Discussion in 'Electronic Design' started by Leon Heller, Jun 22, 2004.

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  1. Leon Heller

    Leon Heller Guest

    The LM387 single-supply low-noise op-amp has been obsolete for some years.
    I'd like to try a circuit out that uses it, and was thinking of using the TI
    OPA2350 instead. They are rather expensive, though. Has anyome got any other
    suggestions?

    Leon
     
  2. Leon Heller wrote...
    THe LM387 features low noise (7nV at 1kHz, vs 13nV for the opa350),
    a nice wide bandwidth (15MHz vs 38MHz) and a respectable slew rate
    (5V/us vs 22V/us). In this comparison, the opa350 family looks OK,
    except it's somewhat noisier than the LM387, as is to be expected,
    with its small-area-MOSFET input stage (Cin = 6.5pF). For example,
    at 40Hz the opa2350 sports 100nV/rt-Hz vs 12nV for the LM387. The
    low operating voltage of the opa2350 is also a severe disadvantage,
    because it means very low output-voltage capability. :>( Another
    issue to consider for preamp ICs is their cable-driving ability.

    Thanks,
    - Win

    (email: use hill_at_rowland-dot-org for now)
     
  3. Leon Heller

    Leon Heller Guest

    Thanks, Win.

    I've actually managed to find a couple of LM387N, at 9 GBP each, in stock at
    one of my suppliers, so I've ordered one. It's for a low-noise direct
    conversion radio pre-amp. I'll get it working with that and then modify the
    circuit and try it with something more modern. They also had lots of
    LM387AN, at 18 GBP. Lower noise, but I think I'll give it a miss at that
    price.

    Leon
     
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