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LM4934_06 Datasheet

  • LM4934_06

  • National Semiconductor [3D Audio Sub-System with Stereo Spe...

  • NSC

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LM4934 3D Audio Sub-System with Stereo Speaker, OCL/SE Stereo Headphone, Earpiece and
Mono Line Level Outputs
February 2006
LM4934
3D Audio Sub-System with Stereo Speaker, OCL/SE
Stereo Headphone, Earpiece and Mono Line Level
Outputs
General Description
The LM4934 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 520mW per
channel into an 8鈩?load, a stereo headphone amplifier de-
livering 36mW per channel into a 32鈩?load, a mono earpiece
amplifier delivering 55mW 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 LM4934 routes and mixes the stereo
and mono inputs into multiple distinct output modes. The
LM4934 features an I2S serial interface for full range audio
and an I2C/SPI compatible interface for control.
Boomer audio power amplifiers are designed specifically to
provide high quality output power with a minimal amount of
external components.
Key Specifications
j
P
OUT
, Stereo BTL, 8鈩? 3.3V,
1% THD+N
j
P
OUT
HP, 32鈩? 3.3V, 1% THD+N
j
P
OUT
Mono Earpiece, 32鈩? 3.3V,
520mW (typ)
36mW (typ)
55mW (typ)
0.6碌A(chǔ) (typ)
95dB (typ)
1% THD+N
j
Shutdown current
j
DAC SNR
Features
n
n
n
n
n
n
n
n
n
n
n
18-bit stereo DAC
Multiple distinct output modes
Stereo speaker amplifier
Stereo headphone amplifier
Mono earpiece amplifier
Mono Line Output for external handsfree carkit
Independent Left, Right, headphone and Mono speaker
volume controls
National 3D enhancement with programmable effect
level
I
2
C/SPI (selectable) compatible interface
Ultra low shutdown current
Click and Pop Suppression circuit
Applications
n
Cell Phones
n
PDAs
Boomer
廬
is a registered trademark of National Semiconductor Corporation.
漏 2006 National Semiconductor Corporation
DS201669
www.national.com

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