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LM4843MH Datasheet

  • LM4843MH

  • Stereo 2W Audio Power Amplifiers with DC Volume Control

  • 19頁(yè)

  • NSC

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LM4843 Stereo 2W Audio Power Amplifiers with DC Volume Control
July 2002
LM4843
Stereo 2W Audio Power Amplifiers
with DC Volume Control
General Description
The LM4843 is a monolithic integrated circuit that provides
DC volume control, and stereo bridged audio power amplifi-
ers capable of producing 2W into 4鈩?(Note 1) with less than
1.0% THD or 2.2W into 3鈩?(Note 2) with less than 1.0%
THD.
Boomer
廬
audio integrated circuits were designed specifically
to provide high quality audio while requiring a minimum
amount of external components. The LM4843 incorporates a
DC volume control with stereo bridged audio power amplifi-
ers making it optimally suited for multimedia monitors, por-
table radios, desktop, and portable computer applications.
The LM4843 features an externally controlled, low-power
consumption shutdown mode, and both a power amplifier
and headphone mute for maximum system flexibility and
performance.
Note 1:
When properly mounted to the circuit board, the LM4843MH will
deliver 2W into 4鈩? See the Application Information section for LM4843MH
usage information.
Note 2:
LM4843MH that has been properly mounted to the circuit board and
forced-air cooled will deliver 2.2W into 3鈩?
Key Specifications
n
P
O
at 1% THD+N
n
into 3鈩?/div>
n
into 4鈩?/div>
n
into 8鈩?/div>
n
Shutdown current
2.2W (typ)
2.0W (typ)
1.1W (typ)
0.7碌A(chǔ) (typ)
Features
n
n
n
n
Acoustically Enhanced DC Volume Control Taper
Stereo bridged power amplifiers
鈥淐lick and pop鈥?suppression circuitry
Thermal shutdown protection circuitry
Applications
n
Portable and Desktop Computers
n
Multimedia Monitors
n
Portable Radios, PDAs, and Portable TVs
Block Diagram
20038389
FIGURE 1. LM4843 Block Diagram
Boomer
廬
is a registered trademark of NationalSemiconductor Corporation.
漏 2002 National Semiconductor Corporation
DS200383
www.national.com

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