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LM4936 Datasheet

  • LM4936

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

  • 28頁

  • NSC

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LM4936 Stereo 2W Audio Power Amplifiers with Volume Control
and Selectable Control Interface (SPI or I
2
C)
April 2005
LM4936
Stereo 2W Audio Power Amplifiers with Volume Control
and Selectable Control Interface (SPI or I
2
C)
General Description
The LM4936 is a monolithic integrated circuit that provides
volume control, and stereo bridged audio power amplifiers
capable of producing 2W into 4鈩?(Note 1) with less than 1%
THD or 2.2W into 3鈩?(Note 2) with less than 1% THD.
Boomer
廬
audio integrated circuits were designed specifically
to provide high quality audio while requiring a minimum
amount of external components. The LM4936 incorporates a
SPI or I
2
C Control Interface that runs the volume control,
stereo bridged audio power amplifiers and a selectable gain
or bass boost. All of the LM4936鈥檚 features (i.e. SD, Mode,
Mute, Gain Sel) make it optimally suited for multimedia
monitors, portable radios, desktop, and portable computer
applications.
The LM4936 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, LM4936MH will deliver
2W into 4鈩? See
Application Information
section
Exposed-DAP package
PCB Mounting Considerations
for more information.
Note 2:
An LM4936MH 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>
2.2W (typ)
n
into 4鈩?/div>
2.0W (typ)
n
into 8鈩?/div>
1.25W (typ)
n
Single-ended mode - THD+N at 90mW into 32鈩?1%(typ)
n
Shutdown current
0.7碌A(chǔ) (typ)
Features
n
n
n
n
n
n
n
Selectable SPI or I
2
C Control Interface
System Beep Detect
Stereo switchable bridged/single-ended power amplifiers
Selectable internal/external gain and bass boost
鈥淐lick and pop鈥?suppression circuitry
Thermal shutdown protection circuitry
Headphone Sense
Applications
n
Portable and Desktop Computers
n
Multimedia Monitors
n
Portable Radios, PDAs, and Portable TVs
Connection Diagram
TSSOP Package
20117802
Top View
Order Number LM4936MH
See NS Package Number MXA28A for Exposed-DAP TSSOP
Boomer
廬
is a registered trademark of NationalSemiconductor Corporation.
漏 2005 National Semiconductor Corporation
DS201178
www.national.com

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