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LM4844

更新时间: 2024-11-06 22:51:51
品牌 Logo 应用领域
美国国家半导体 - NSC /
页数 文件大小 规格书
21页 980K
描述
Stereo 1.2W Audio Sub-system with 3D Enhancement

LM4844 数据手册

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June 2005  
LM4844  
Stereo 1.2W Audio Sub-system with 3D Enhancement  
General Description  
Key Specifications  
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 8load and a stereo OCL headphone  
amplifier delivering 33mW per channel into a 32load.  
It integrates the audio amplifiers, volume control, mixer,  
power 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 I2C compatible  
interface.  
j
POUT, Stereo BTL, 8, 3.3V,  
1% THD+N  
495mW (typ)  
j
POUT HP, 32, 3.3V,  
1% THD+N  
33mW (typ)  
0.1µA (typ)  
j
Shutdown Current, 3.3V  
Features  
n Stereo speaker amplifier  
n Stereo OCL headphone amplifier  
Boomer audio power amplifiers are designed specifically to  
provide high quality output power with a minimal amount of  
external components.  
n Independent Left, Right, and Mono volume controls  
n National 3D enhancement  
n I2C compatible interface  
The LM4844 is available in a very small 2.5mm x 2.9mm  
30-bump micro SMD (TL) package.  
n Ultra low shutdown current  
n Click and Pop Suppression circuit  
n 10 distinct output modes  
Applications  
n Cell Phones  
n PDAs  
n Portable Gaming Devices  
n Internet Appliances  
n Portable DVD, CD, AAC, and MP3 Players  
Block Diagram  
20153531  
FIGURE 1. Audio Sub-system Block Diagram  
Boomer® is a registered trademark of National Semiconductor Corporation.  
© 2005 National Semiconductor Corporation  
DS201535  
www.national.com  

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