LM4859 datasheet(1/29 Pages) NSC

Part #	LM4859

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

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Manufacturer	NSC [National Semiconductor (TI)]

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LM4859

Stereo 1.2W Audio Sub-system with 3D Enhancement

General Description

The LM4859 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 headphone amplifier

delivering 33mW per channel into a 32

Ω load. It integrates

the audio amplifiers, volume control, mixer, power manage-

ment control, and National 3D enhancement all into a single

package. In addition, the LM4859 routes and mixes the

stereo and mono inputs into 10 distinct output modes. The

LM4859 is controlled through an I

2C compatible interface.

Other features include an ultra-low current shutdown mode

and thermal shutdown protection.

Boomer audio power amplifiers are designed specifically to

provide high quality output power with a minimal amount of

external components.

The LM4859 is available in a 28–lead LLP package.

Key Specifications

j POUT, Stereo Loudspeakers, 4

Ω, 5V,

1% THD+N (LM4859SP)

1.6W (typ)

j POUT, Stereo Loudspeakers, 8

Ω, 5V,

1% THD+N

1.2W (typ)

j POUT, Stereo Headphones, 32

Ω, 5V,

1% THD+N

75mW (typ)

j POUT, Stereo Loudspeakers, 8

Ω, 3.3V,

1% THD+N

495mW (typ)

j POUT, Stereo Headphones, 32

Ω, 3.3V,

1% THD+N

33mW (typ)

j Shutdown Current

0.06µA (typ)

Features

n

Stereo speaker amplifier

n

Stereo 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

n

Thermal Shutdown Protection

n

Available in an LLP package

Applications

n

Cell Phones

n

PDAs

n

Portable Gaming Devices

n

Internet Appliances

n

Portable DVD/CD/AAC/MP3 players

Boomer® is a registered trademark of National Semiconductor Corporation.

November 2004

DS201061

www.national.com

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LM4859 Datasheet(PDF) 1 Page - National Semiconductor (TI)

LM4859 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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