LM4934_06 Datasheet, PDF (1/39 Pages) National Semiconductor (TI) – 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 8Ω load, a stereo headphone amplifier de-
livering 36mW per channel into a 32Ω load, a mono earpiece
amplifier delivering 55mW into a 32Ω 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, 8Ω, 3.3V,
1% THD+N
j P_OUT HP, 32Ω, 3.3V, 1% THD+N
j P_OUT Mono Earpiece, 32Ω, 3.3V,
1% THD+N
j Shutdown current
j DAC SNR
520mW (typ)
36mW (typ)
55mW (typ)
0.6µA (typ)
95dB (typ)
Features
n 18-bit stereo DAC
n Multiple distinct output modes
n Stereo speaker amplifier
n Stereo headphone amplifier
n Mono earpiece amplifier
n Mono Line Output for external handsfree carkit
n Independent Left, Right, headphone and Mono speaker
volume controls
n National 3D enhancement with programmable effect
level
n I²C/SPI (selectable) compatible interface
n Ultra low shutdown current
n Click and Pop Suppression circuit
Applications
n Cell Phones
n PDAs
Boomer^® is a registered trademark of National Semiconductor Corporation.
© 2006 National Semiconductor Corporation DS201669
www.national.com