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LM4834MS Datasheet

  • LM4834MS

  • 1.75W Audio Power Amplifier with DC Volume Control and Micro...

  • 12頁

  • NSC

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LM4834 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 4鈩?with less than 1.0%
(THD). In addition, the headphone/lineout amplifier is ca-
pable of driving 70 mW into 32鈩?with less than 0.1%(THD).
The LM4834 incorporates a volume control and an input mi-
crophone preamp stage capable of driving a 1 k鈩?load im-
pedance.
Boomer
廬
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 8鈩?at 1 kHz
n
Output Power into 4鈩?at 1.0%
THD+N
n
THD at 70mW continuous average
output power into 32鈩?at 1 kHz
n
Shutdown Current
n
Supply Current
0.5%(max)
1.75W(typ)
0.1%(typ)
1.0碌A(max)
17.5mA(typ)
Features
n
PC98 Compliant
n
鈥淐lick and Pop鈥?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
DS100015-2
DS100015-1
FIGURE 1. LM4834 Block Diagram
Top View
Order Number LM4834MS
See NS Package Number MSA028CB for SSOP
Boomer
廬
is a registered trademark of NationalSemiconductor Corporation.
漏 1997 National Semiconductor Corporation
DS100015
www.national.com

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