LM4918 Datasheet, PDF (1/17 Pages) National Semiconductor (TI) – Stereo Audio Amp with AGC Control

February 2004
LM4918
Stereo Audio Amp with AGC Control
General Description
The LM4918 is a monolithic integrated circuit that provides a
automatic gain control (AGC), and stereo bridged audio
power amplifiers capable of producing 1W into 8Ω with less
than 1.0% THD.
Boomer^® audio integrated circuits were designed specifically
to provide high quality audio while requiring a minimum
amount of external components. The LM4918 incorporates a
AGC and stereo bridged audio power amplifiers making it
optimally suited for multimedia monitors, portable radios,
desktop and portable computer applications.
The LM4918 features an externally controlled, low-power
consumption shutdown mode, and a power amplifier mute
for maximum system flexibility and performance.
Key Specifications
j THD+N at 1kHz, 1W, 8Ω
j Total quiescent power supply current
j Total shutdown power supply current
0.3% (typ)
18mA (typ)
1µA (typ)
Features
n 0.75dB per step/32step AGC Control Interface
n Automatic Gain Control Circuitry
n Stereo Bridged power amplifiers
n “Click and pop” suppression circuitry
n Thermal shutdown protection circuitry
n Selectable Auto Detect Std-by mode and Logic control
Applications
n Portable Computers
n Desktop Computers
n Multimedia monitors
Typical Application
20091301
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer^® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation DS200913
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