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From: km3t@jjmhome.UUCP (Dave Pascoe KM3T)
Newsgroups: sci.electronics
Subject: Re: line level and op amps
Summary: Linear Technology
Keywords: op amp, line level
Message-ID: <9431@jjmhome.UUCP>
Date: 9 Jan 91 04:03:07 GMT
References: <1991Jan8.072135.15225@wam.umd.edu>
Distribution: usa
Lines: 26

In article <1991Jan8.072135.15225@wam.umd.edu>, elwood@wam.umd.edu (Jim Bogard) writes:
> Ok, a pair of questions:
 other stuff deleted
 
> 
> 2. What's the lowest noise op amp?
>    (Don't read too much into this; nothing esoteric, just whatis
>    the quietest general purpose op amp. eg, 741,386, etc.)

For audio work one of the quietest op-amps I've seen is the LT1115 manufactured
by Linear Technology (Milpitas, CA).  The LT1115 has a voltage noise on the
order of 1.2nV/root Hz at 1kHz (0.9nV typical).  Here are some other specs:

Gain-Bandwidth Product: 40MHz Min.
Slew Rate: 10V/us Min.
Voltage Gain: 2 Million Min.
.002% Total Harmonic Distortion @ 10kHz, Av=-10, R(load)=600 ohms Vo=7Vrms
.0002% Intermodulation Distortion (IMD), CCIF Method, Av=+10, R(load)=600 ohms
Vo=7Vrms

It's a great amp for high quality audio work , like for preamps and any other
type of low noise application (frequency synthesizer).

-- 
Dave Pascoe | Internet: km3t@jjmhome.m2c.org 
KM3T/ZF2PT  | UUCP: km3t@jjmhome.UUCP  or  ...!{harvard}!m2c!jjmhome!km3t