LM4834 Datasheet, PDF (1/12 Pages) National Semiconductor (TI) – 1.75W Audio Power Amplifier with DC Volume Control and Microphone Preamp

November 1997
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 ca-
pable 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 mi-
crophone preamp stage capable of driving a 1 kΩ load im-
pedance.
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.
Key Specifications
n THD at 1.1W continuous average
output power into 8Ω at 1 kHz
n Output Power into 4Ω at 1.0%
THD+N
n THD at 70mW continuous average
output power into 32Ω at 1 kHz
n Shutdown Current
n Supply Current
0.5%(max)
1.75W(typ)
0.1%(typ)
1.0µA(max)
17.5mA(typ)
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
Block Diagram
Connection Diagram
SSOP Package
DS100015-1
FIGURE 1. LM4834 Block Diagram
Boomer^® is a registered trademark of NationalSemiconductor Corporation.
© 1997 National Semiconductor Corporation DS100015
DS100015-2
Top View
Order Number LM4834MS
See NS Package Number MSA028CB for SSOP
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