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LM4844 Stereo 1.2W Audio Sub-system with 3D Enhancement

June 2005

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

amplifier delivering 33mW per channel into a 32鈩?load.

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 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.

Key Specifications

j

P

OUT

, Stereo BTL, 8鈩? 3.3V,

1% THD+N

j

P

OUT

HP, 32鈩? 3.3V,

495mW (typ)

33mW (typ)

0.1碌A(chǔ) (typ)

1% THD+N

j

Shutdown Current, 3.3V

Features

n

n

n

n

n

n

n

n

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

n

n

n

n

n

Cell Phones

PDAs

Portable Gaming Devices

Internet Appliances

Portable DVD, CD, AAC, and MP3 Players

Block Diagram

20153531

FIGURE 1. Audio Sub-system Block Diagram

Boomer

廬

is a registered trademark of National Semiconductor Corporation.

漏 2005 National Semiconductor Corporation

DS201535

www.national.com

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LM4844相關(guān)型號(hào)PDF文件下載

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