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LM4844_07 Datasheet

  • LM4844_07

  • National Semiconductor [Stereo 1.2W Audio Sub-System with 3...

  • NSC

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LM4844 Stereo 1.2W Audio Sub-System with 3D Enhancement
August 2007
LM4844
Stereo 1.2W Audio Sub-System with 3D Enhancement
General Description
The LM4844 is an integrated audio sub-system designed for
stereo cell phone applications. Operating on a 3.3V supply, it
combines a stereo speaker amplifier delivering 495mW per
channel into an 8鈩?load and a stereo OCL headphone am-
plifier delivering 33mW per channel into a 32鈩?load.
It integrates the audio amplifiers, volume control, mixer, pow-
er management control, and National 3D enhancement all
into a single package. In addition, the LM4844 routes and
mixes the stereo and mono inputs into 10 distinct output
modes. The LM4844 is controlled through an I
2
C compatible
interface.
Boomer audio power amplifiers are designed specifically to
provide high quality output power with a minimal amount of
external components.
The LM4844 is available in a very small 2.5mm x 2.9mm 30-
bump micro SMD (TL) package.
Features
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Stereo speaker amplifier
Stereo OCL headphone amplifier
Independent Left, Right, and Mono volume controls
National 3D enhancement
I
2
C compatible interface
Ultra low shutdown current
Click and Pop Suppression circuit
10 distinct output modes
Applications
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Cell Phones
PDAs
Portable Gaming Devices
Internet Appliances
Portable DVD, CD, AAC, and MP3 Players
Key Specifications
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P
OUT
, Stereo BTL, 8鈩? 3.3V,
1% THD+N
495mW (typ)
33mW (typ)
0.1渭A
(typ)
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P
OUT
HP, 32鈩? 3.3V,
1% THD+N
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Shutdown Current, 3.3V
Boomer廬 is a registered trademark of National Semiconductor Corporation.
漏 2007 National Semiconductor Corporation
201535
www.national.com

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