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LM4849 Datasheet

  • LM4849

  • Stereo 2W Audio Power Amplifiers with DC Volume Control and ...

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LM4849 Stereo 2W Audio Power Amplifiers with DC Volume Control and Input Mux
August 2003
LM4849
Stereo 2W Audio Power Amplifiers
with DC Volume Control and Input Mux
General Description
The LM4849 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+N, or 2.2W into 3鈩?(Note 2) with less than 1.0%
THD+N.
Boomer
廬
audio integrated circuits were designed specifically
to provide high quality audio while requiring a minimum
amount of external components. The LM4849 incorporates a
DC volume control, stereo bridged audio power amplifiers,
and an input mux making it optimally suited for multimedia
monitors, portable radios, desktop, and portable computer
applications.
The LM4849 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 LM4849MH will
deliver 2W into 4鈩? See the Application Information section for LM4849MH
usage information.
Note 2:
An LM4849MH that has been properly mounted to the circuit board
and forced-air cooled will deliver 2.2W into 3鈩?
Key Specifications
j
P
O
at 1% THD+N
into 3鈩?(Note2)
into 4鈩?(Note1)
into 8鈩?/div>
j
Single-ended mode - THD+N at 85mW
2.2W (typ)
2.0W (typ)
1.1W (typ)
1.0% (typ)
0.2碌A(chǔ) (typ)
into 32鈩?/div>
j
Shutdown Current
Features
n
n
n
n
n
DC Volume Control Interface
Input mux
Stereo switchable bridged/single-ended power amplifiers
鈥淐lick and pop鈥?suppression circuitry
Thermal shutdown protection circuitry
Applications
n
Portable and Desktop Computers
n
Multimedia, LCD Monitors/TV
n
Portable Radios, PDAs, and Portable TVs
Connection Diagram
TSSOP Package
20076702
Top View
Order Number LM4849MH
See NS Package Number MXA28A for Exposed-DAP TSSOP
Boomer
廬
is a registered trademark of NationalSemiconductor Corporation.
漏 2003 National Semiconductor Corporation
DS200767
www.national.com

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