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LM4857_05 Datasheet

  • LM4857_05

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

  • NSC

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LM4857 Stereo 1.2W Audio Sub-system with 3D Enhancement
June 2005
LM4857
Stereo 1.2W Audio Sub-system with 3D Enhancement
General Description
The LM4857 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, a stereo headphone amplifier de-
livering 33mW per channel into a 32鈩?load, a mono earpiece
amplifier delivering 43mW into a 32鈩?load, and a line output
for an external powered handsfree speaker. It integrates the
audio amplifiers, volume control, mixer, power management
control, and National 3D enhancement all into a single pack-
age. In addition, the LM4857 routes and mixes the stereo
and mono inputs into 16 distinct output modes. The LM4857
is controlled through an I
2
C compatible interface. Other fea-
tures include an ultra-low current shutdown mode and ther-
mal shutdown protection.
Boomer audio power amplifiers are designed specifically to
provide high quality output power with a minimal amount of
external components.
The LM4857 is available in a 30-bump ITL package and a
28鈥搇ead LLP package.
Key Specifications
j
P
OUT
, Stereo Loudspeakers, 4鈩? 5V,
1% THD+N (LM4857SP)
j
P
OUT
, Stereo Loudspeakers, 8鈩? 5V,
1.6W (typ)
1.2W (typ)
75mW (typ)
100mW (typ)
495mW (typ)
33mW (typ)
43mW (typ)
0.06碌A(chǔ) (typ)
1% THD+N
j
P
OUT
, Stereo Headphones, 32鈩? 5V,
1% THD+N
j
P
OUT
, Mono Earpiece, 32鈩? 5V,
1% THD+N
j
P
OUT
, Stereo Loudspeakers, 8鈩? 3.3V,
1% THD+N
j
P
OUT
, Stereo Headphones, 32鈩? 3.3V,
1% THD+N
j
P
OUT
, Mono Earpiece, 32鈩? 3.3V,
1% THD+N
j
Shutdown Current
Features
n
n
n
n
n
n
n
n
n
n
n
n
Stereo speaker amplifier
Stereo headphone amplifier
Mono earpiece amplifier
Mono Line Output for external handsfree carkit
Independent Left, Right, and Mono volume controls
National 3D enhancement
I
2
C compatible interface
Ultra low shutdown current
Click and Pop Suppression circuit
16 distinct output modes
Thermal Shutdown Protection
Available in micro SMD and LLP packages
Applications
n
n
n
n
n
Cell Phones
PDAs
Portable Gaming Devices
Internet Appliances
Portable DVD/CD/AAC/MP3 players
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2005 National Semiconductor Corporation
DS200797
www.national.com

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