LM4832M

Manufacturer Part NumberLM4832M
DescriptionDigitally Controlled Tone and Volume Circuit with Stereo Audio Power Amplifier, Microphone Preamp Stage and National 3D Sound
ManufacturerNational Semiconductor
LM4832M datasheet
 


Specifications of LM4832M

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LM4832
Digitally Controlled Tone and Volume Circuit with Stereo
Audio Power Amplifier, Microphone Preamp Stage and
National 3D Sound
General Description
The LM4832 is a monolithic integrated circuit that provides
volume and tone (bass and treble) controls as well as a
stereo audio power amplifier capable of producing 250 mW
(typ) into 8Ω or 90 mW (typ) into 32Ω with less than 1.0%
THD. In addition, a two input microphone preamp stage, with
volume control, capable of driving a 1 kΩ load is imple-
mented on chip.
The LM4832 also features National’s 3D Sound circuitry
which can be externally adjusted via a simple RC network.
For maximum system flexibility, the LM4832 has an exter-
nally controlled, low-power consumption shutdown mode,
and an independent mute for power and microphone ampli-
fiers .
Boomer
®
audio integrated circuits were designed specifically
to provide high quality audio while requiring few external
components. Since the LM4832 incorporates tone and vol-
ume controls, a stereo audio power amplifier and a micro-
phone preamp stage, it is optimally suited to multimedia
monitors and desktop computer applications.
Block Diagram
Boomer
®
is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation
Key Specifications
n Output Power at 10% into 8Ω
n Output Power at 10% into 32Ω
n THD+N at 75mW into 32Ω at 1kHz
n Microphone Input Referred Noise
n Supply Current
n Shutdown Current
Features
n Independent Left and Right Output Volume Controls
n Treble and Bass Control
n National 3D Sound
2
n I
C Compatible Interface
n Two Microphone Inputs with Selector
n Software Controlled Shutdown Function
Applications
n Multimedia Monitors
n Portable and Desktop Computers
FIGURE 1. LM4832 Block Diagram
DS100014
December 2003
350mW (typ)
100mW (typ)
0.5% (max)
7µV (typ)
13mA (typ)
4µA (typ)
10001401
www.national.com

LM4832M Summary of contents