LME49870 Datasheet, PDF (1/34 Pages) National Semiconductor (TI) – 44V Single High Performance, High Fidelity Audio Operational Amplifier

January 14, 2008
LME49870
44V Single High Performance, High Fidelity Audio
Operational Amplifier
General Description
The LME49870 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 LME49870 audio opera-
tional amplifier delivers superior audio signal amplification for
outstanding audio performance. The LME49870 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 LME49870
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 LME49870's outstanding CMRR (120dB), PSRR
(120dB), and V_OS (0.1mV) give the amplifier excellent oper-
ational amplifier DC performance.
The LME49870 has a wide supply range of ±2.5V to ±22V.
Over this supply range the LME49870 maintains excellent
common-mode rejection, power supply rejection, and low in-
put bias current. The LME49870 is unity gain stable. This
Audio Operational Amplifier achieves outstanding AC perfor-
mance while driving complex loads with values as high as
100pF.
The LME49870 is available in 8–lead narrow body SOIC.
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)
±2.5V to ±22V
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
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)}
Applications
■ ^{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
Passively Equalized RIAA Phono Preamplifier
© 2008 National Semiconductor Corporation 300194
300194k5
www.national.com