LME49740 Datasheet, PDF (1/20 Pages) National Semiconductor (TI) – Quad High Performance, High Fidelity Audio Operational Amplifier

February 2007
LME49740
Quad High Performance, High Fidelity Audio Operational
Amplifier
General Description
The LME49740 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 LME49740 audio opera-
tional amplifiers deliver superior audio signal amplification for
outstanding audio performance. The LME49740 combines
extremely low voltage noise density (2.7nV/√HZ) with van-
ishingly low THD+N (0.00003%) to easily satisfy the most
demanding audio applications. To ensure that the most chal-
lenging loads are driven without compromise, the LME49740
has a high slew rate of ±20V/μs and an output current capa-
bility 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 LME49740's outstanding CMRR(120dB), PSRR(120dB),
and V_OS(0.1mV) give the amplifier excellent operational am-
plifier DC performance.
The LME49740 has a wide supply range of ±2.5V to ±17V.
Over this supply range the LME49740’s input circuitry main-
tains excellent common-mode and power supply rejection, as
well as maintaining its low input bias current. The LME49740
is unity gain stable. The Audio Operational Amplifier achieves
outstanding AC performance while driving complex loads with
values as high as 100pF.
The LME49740 is available in 14–lead narrow body SOIC and
14–lead plastic DIP. Demonstration boards are available for
each package.
Key Specifications
■ Power Supply Voltage Range
■ THD+N (A_V = 1, V_OUT = 3V_RMS,
  f_IN = 1kHz)
R_L = 2kΩ
R_L = 600Ω
■ Input Noise Density
■ Slew Rate
■ Gain Bandwidth Product
■ Open Loop Gain (R_L = 600Ω)
■ Input Bias Current
■ Input Offset Voltage
■ DC Gain Linearity Error
±2.5V to ±17V
0.00003% (typ)
0.00003% (typ)
2.7nV/√Hz (typ)
±20V/μs (typ)
55MHz (typ)
140dB (typ)
10nA (typ)
0.1mV (typ)
0.000009%
Features
■ ^{Easily drives 600Ω loads}
■ ^{Optimized for superior audio signal fidelity}
■ ^{Output short circuit protection}
■ ^{PSRR and CMRR exceed 120dB (typ)}
■ ^{SOIC and DIP packages}
Applications
■ ^{Ultra high quality audio amplification}
■ ^{High fidelity preamplifiers}
■ ^{High fidelity multimedia}
■ ^{State of the art phono pre amps}
■ ^{High performance professional audio}
■ ^{High fidelity equalization and crossover networks}
■ ^{High performance line drivers}
■ ^{High performance line receivers}
■ ^{High fidelity active filters}
© 2007 National Semiconductor Corporation 202105
www.national.com