LME49725 Datasheet, PDF (1/24 Pages) National Semiconductor (TI) – PowerWise Dual High Performance, High Fidelity Audio Operational Amplifier

April 3, 2008
LME49725
PowerWise® Dual High Performance, High Fidelity Audio
Operational Amplifier
General Description
The LME49725 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 LME49725 audio opera-
tional amplifiers deliver superior audio signal amplification for
outstanding audio performance. The LME49725 combines
extremely low voltage noise density (3.3nV/√Hz) with van-
ishingly low THD+N (0.00004%) to easily satisfy the most
demanding audio applications. To ensure that the most chal-
lenging loads are driven without compromise, the LME49725
has a high slew rate of ±15V/μs and an output current capa-
bility of ±22mA. 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.
Part of the PowerWise® family of energy efficient solutions,
the LME49725 consumes only 3.0mA of supply current per
amplifier while providing superior performance to high perfor-
mance, high fidelity applications.
The LME49725's outstanding CMRR (120dB), PSRR
(120dB), and V_OS (0.5mV) give the amplifier excellent oper-
ational amplifier DC performance.
The LME49725 has a wide supply range of ±4.5V to ±18V.
Over this supply range the LME49725’s input circuitry main-
tains excellent common-mode and power supply rejection, as
well as maintaining its low input bias current. The LME49725
is unity gain stable. This audio operational amplifier achieves
outstanding AC performance while driving complex loads with
values as high as 100pF.
The LME49725 is available in 8–lead narrow body SOIC.
Key Specifications
■ Power Supply Voltage Range
■ THD+N
(A_V = 1, V_OUT = 3V_RMS, f_IN = 1kHz)
R_L = 2kΩ
R_L = 600Ω
■ Quiescent current per Amplifier
■ Input Noise Density
■ Slew Rate
■ Gain Bandwidth Product
■ Open Loop Gain (R_L = 600Ω)
■ Input Bias Current
■ Input Offset Voltage
■ DC Gain Linearity Error
±4.5V to ±18V
0.00004% (typ)
0.00004% (typ)
3.0mA (typ)
3.3nV/√Hz (typ)
±15V/μs (typ)
40MHz (typ)
135dB (typ)
15nA (typ)
0.5mV (typ)
0.000009% (typ)
Features
■ ^{Optimized for superior audio signal fidelity}
■ ^{Output short circuit protection}
■ ^{PSRR and CMRR exceed 120dB (typ)}
Applications
■ ^{Audio amplification}
■ ^{Preamplifiers}
■ ^Multimedia
■ ^{Phono preamplifiers}
■ ^{Professional audio}
■ ^{Equalization and crossover networks}
■ ^{Line drivers}
■ ^{Line receivers}
■ ^{Active filters}
© 2008 National Semiconductor Corporation 300342
www.national.com