LM4834-MS

Manufacturer Part NumberLM4834-MS
ManufacturerNational Semiconductor
LM4834-MS datasheet
 


Specifications of LM4834-MS

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LM4834
1.75W Audio Power Amplifier with DC Volume Control
and Microphone Preamp
General Description
The LM4834 is a monolithic integrated circuit that provides
DC volume control, and a bridged audio power amplifier
capable of producing 1.75W into 4Ω with less than 1.0%
(THD). In addition, the headphone/lineout amplifier is ca-
pable of driving 70 mW into 32Ω with less than 0.1%(THD).
The LM4834 incorporates a volume control and an input
microphone preamp stage capable of driving a 1 kΩ load
impedance.
Boomer
®
audio integrated circuits were designed specifically
to provide high quality audio while requiring a minimum
amount of external components in surface mount packaging.
The LM4834 incorporates a DC volume control, a bridged
audio power amplifier and a microphone preamp stage,
making it optimally suited for multimedia monitors and desk-
top computer applications.
The LM4834 features an externally controlled, low-power
consumption shutdown mode, and both a power amplifier
and headphone mute for maximum system flexibility and
performance.
Block Diagram
FIGURE 1. LM4834 Block Diagram
Boomer
®
is a registered trademark of NationalSemiconductor Corporation.
© 2004 National Semiconductor Corporation
Key Specifications
n THD at 1.1W continuous average output power into 8Ω
at 1kHz
n Output Power into 4Ω at 1.0% THD+N
n THD at 70mW continuous average output power into
32Ω at 1kHz
n Shutdown Current
n Supply Current
Features
n PC98 Compliant
n “Click and Pop” suppression circuitry
n Stereo line level outputs with mono input capability for
system beeps
n Microphone preamp with buffered power supply
n DC Volume Control Interface
n Thermal shutdown protection circuitry
Applications
n Multimedia Monitors
n Desktop and Portable Computers
Connection Diagram
See NS Package Number MSA028CB for SSOP
10001501
DS100015
August 2000
0.5% (max)
1.75W (typ)
0.1% (typ)
1.0µA (max)
17.5mA (typ)
SSOP Package
10001502
Top View
Order Number LM4834MS
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