LM4844 datasheet(1/21 Pages) NSC

Part #	LM4844

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

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Manufacturer	NSC [National Semiconductor (TI)]

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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

Ω load and a stereo OCL headphone

amplifier delivering 33mW per channel into a 32

Ω 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

2C 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 POUT, Stereo BTL, 8

Ω, 3.3V,

1% THD+N

495mW (typ)

j POUT HP, 32

Ω, 3.3V,

1% THD+N

33mW (typ)

j Shutdown Current, 3.3V

0.1µA (typ)

Features

n

Stereo speaker amplifier

n

Stereo OCL headphone amplifier

n

Independent Left, Right, and Mono volume controls

n

National 3D enhancement

n

I

2C compatible interface

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

Boomer® is a registered trademark of National Semiconductor Corporation.

20153531

FIGURE 1. Audio Sub-system Block Diagram

June 2005

DS201535

www.national.com

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LM4844 Datasheet(PDF) 1 Page - National Semiconductor (TI)

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