LME49722 Datasheet, PDF (1/14 Pages) National Semiconductor (TI) – Low Noise, High Performance, High Fidelity Dual Audio Operational Amplifier

March 27, 2008
LME49722
Low Noise, High Performance, High Fidelity Dual Audio
Operational Amplifier
General Description
The LME49722 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 LME49722 audio opera-
tional amplifiers deliver superior audio signal amplification for
outstanding audio performance. The LME49722 combines
extremely low voltage noise density (1.9nV/√Hz) rate with
vanishingly low THD+N (0.00002%) to easily satisfy the most
demanding audio applications. To ensure that the most chal-
lenging loads are driven without compromise, the LME49722
has a high slew rate of ±22V/µs and an output current capa-
bility of ±28mA. Further, dynamic range is maximized by an
output stage that drives 2kΩ loads to within 1V of either power
supply voltage.
The LME49722 has a wide supply range of ±2.5V to ±18V.
Over this supply range the LME49722 maintains excellent
common-mode and power supply rejection, and low input bias
current. This Audio Operational Amplifier achieves outstand-
ing AC performance while driving complex loads with values
as high as 100pF with gain value greater than 2. Directly in-
terchangeable with LME49720, LM4562 and LME49860 for
similar operating voltages.
Key Specifications
■ Wide Operating Voltage Range
■ Equivalent Noise
(Frequency = 1kHz)
■ Equivalent Noise
(Frequency = 10Hz)
±2.5V to ±18V
1.9nV/√Hz (typ)
2.8nV/√Hz (typ)
■ PSRR
■ Slew Rate
■ THD+N
(A_V = 1, V_OUT = 3V_RMS, f_IN = 1kHz)
R_L = 2kΩ
R_L = 600Ω
■ Open Loop Gain (R_L = 600Ω)
■ Input Bias Current
■ Voltage Offset
120dB (typ)
±22V/μs (typ)
0.00002% (typ)
0.00002% (typ)
135dB (typ)
50nA (typ)
±0.02mV (typ)
Features
■ ^{Easily drives 600Ω loads}
■ ^{Optimized for superior audio signal fidelity}
■ ^{Output short circuit protection}
■ ^{PSRR and CMRR exceed 120dB (typ)}
Applications
■ ^{Ultra high quality audio amplification}
■ ^{High fidelity preamplifiers, phono preamps, and}
multimedia
■ ^{High performance professional audio}
■ ^{High fidelity equalization and crossover networks with}
active filters
■ ^{High performance line drivers and receivers}
■ ^{Low noise industrial applications including test,}
measurement, and ultrasound
Typical Application
30057910
FIGURE 1. Wide Bandwidth Low Noise Low Drift Amplifier
© 2008 National Semiconductor Corporation 300579
www.national.com