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Thread: LME49860 opamp buy

  1. #1
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    LME49860 opamp buy

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    Hi All,

    I'll be buying at least 100 LME49860 opamps RSN (real soon new) This gets me into the under $3.00 USD per device range.

    The offer is: If you want some of these I will add your request onto my order and charge you actual cost plus shipping and any paypal fees.

    I'll be ordering the 8 pin dip package.

    The datasheet is at: http://cache.national.com/ds/LM/LME49860.pdf

    List price is $5 each and some fool is selling 2 for 12.95 on eBay.

    Why use this opamp? Well it does handle 22v rails and has great specs as well as sounding good to many ears. And $3 is not bad!

    Here is the National writeup:

    The LME49860 is part of the ultra-low distortion, low noise, high slew rate operational amplifier series optimized and fully specified for high performance, high fidelity applications. Combining advanced leading-edge process technology with state-of-the-art circuit design, the LME49860 audio operational amplifiers deliver superior audio signal amplification for outstanding audio performance. The LME49860 combines extremely low voltage noise density (2.7nV/ √^Hz) with vanishingly low THD+N (0.00003%) to easily satisfy the most demanding audio applications. To ensure that the most challenging loads are driven without compromise, the LME49860 has a high slew rate of 20V/μs and an output current capability of 26mA. Further, dynamic range is maximized by an output stage that drives 2kΩ loads to within 1V of either power supply voltage and to within 1.4V when driving 600Ω loads.

    The LME49860's outstanding CMRR (120dB), PSRR (120dB), and VOS (0.1mV) give the amplifier excellent operational amplifier DC performance.

    The LME49860 has a wide supply range of 2.5V to 22V. Over this supply range the LME49860 maintains excellent common-mode rejection, power supply rejection, and low input bias current. The LME49860 is unity gain stable. This Audio Operational Amplifier achieves outstanding AC performance while driving complex loads with values as high as 100pF.
    In Sunny Vancouver ..... (Washington)

  2. #2
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    i dont need any at present but i can vouch for them... that's one of several op-amps i recommended for SB's M520 project... way cool part...
    37.8% of all statistics are made up on the spot...

    hey give a guy some room... people are trying to evolve here... for crying out loud...

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    I employed the LME49860 in my RX-7 on the bus modules and was very happy with their performance. Newark had a special on them last spring and I was able to get them for $3 and change in the single quantities. They sold out really fast

    If you are looking for a more affordable device with sound like the LME49860 look into the TLE2141.
    http://focus.ti.com/docs/prod/folder...t/tle2141.html

    I experimented with these in my RX-7 and honestly couldn't hear much difference between them and the LME49860. The specs don't look as good for the TLE2141 but my ears really couldn't tell. It's another great sounding device for about half the price.
    If you could see crime in a mans face we wouldn't have any mirrors - H. Bogart
    Somnium7
    Somnium7 on MySpace

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    So what's the current draw on an LME49860 compared to the OPA2134? Wondering about PS impact...

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    4 vs 10

    Quote Originally Posted by sweetbeats View Post
    So what's the current draw on an LME49860 compared to the OPA2134? Wondering about PS impact...

    The opa2134 idles at 4 mA per amp (8 mA per dual) the LME49860 idles at 10 mA per amp (20 mA per dual)

    About 2.5 time more.

    Keep in mind that each opamp can drive about the same load current.

    opa drives 35 mA the LME drives 31 mA.

    Max current is: opa 40, lme 53.

    So I would guess that your idle current dissapation would be 2.5 times greater but your full signal use would be close to the same. The PS would need to be sized to handle full load current draw plus a comfortable margin. At least well designed PS are that way (and the PS-520 is)

    --Ethan
    In Sunny Vancouver ..... (Washington)

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    Cool that makes sense...I think...

    If I understand correctly, in analogous terms, the engine (PS) will need to idle at, say, 2000rpm instead of 800rpm to support the mods, and the redline will need to be about 25% higher, but that's no trouble since the engine in this case (the PS-520) has a redline much higher than even the 25% over stock demand?

    This is assuming a board loaded with LME49860's yes?

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    Thats true

    Higher idle is normal in a performance engine. Gotta over come those cams.


    Now to the real news - Ordered a pile of opamps today. Looking forward to getting them in and selling some on eBay for an arm and a leg to pay for those that I need.
    In Sunny Vancouver ..... (Washington)

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    Question So, the TLE2141...

    So Somnium (or anybody of course)

    If you had a choice between the OPA2134 and the TLE2141, disregarding price, which would you choose?

    And would I be looking for option 1, option 2, or option 3?

    At any rate am I correct in assuming that the TLE2141 would (as with the OPA2134) be an improvement over the TL072?

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    unless i'm experiencing another brain fart i dont think you want any of those options... i thought it said they're all single op-amps... op1 was suggested for single supply low voltage designs... though the others did show similar specs... op2 was generic use... op3 can't remember exactly what the "A" designates exactly but IIRC it's tighter tolerance and hotrodded somehow... and yes they would be way past the tl072's though they were very cool at the time... but tech marches on...
    37.8% of all statistics are made up on the spot...

    hey give a guy some room... people are trying to evolve here... for crying out loud...

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    Well...duh...no wonder they're so cheap...they are singles. The 2142 is comparable in price to the LME chip in quantity, so...hm.

    Thanks for posting that, demented.

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