lm4857itl National Semiconductor Corporation, lm4857itl Datasheet

lm4857itl

Manufacturer Part Number

lm4857itl

Description

Stereo 1.2w Audio Sub-system With 3d Enhancement

Manufacturer

National Semiconductor Corporation

Datasheet

1.LM4857ITL.pdf (37 pages)

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LM4857

Stereo 1.2W Audio Sub-system with 3D Enhancement

General Description

The LM4857 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 8Ω load, a stereo headphone amplifier de-

livering 33mW per channel into a 32Ω load, a mono earpiece

amplifier delivering 43mW 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 LM4857 routes and mixes the stereo

and mono inputs into 16 distinct output modes. The LM4857

is controlled through an I

tures include an ultra-low current shutdown mode and ther-

mal shutdown protection.

Boomer audio power amplifiers are designed specifically to

provide high quality output power with a minimal amount of

external components.

The LM4857 is available in a 30-bump ITL package and a

28–lead LLP package.

Boomer

is a registered trademark of National Semiconductor Corporation.

C compatible interface. Other fea-

DS200797

Key Specifications

Features

n Stereo speaker amplifier

n Stereo headphone amplifier

n Mono earpiece amplifier

n Mono Line Output for external handsfree carkit

n Independent Left, Right, and Mono volume controls

n National 3D enhancement

n I

n Ultra low shutdown current

n Click and Pop Suppression circuit

n 16 distinct output modes

n Thermal Shutdown Protection

n Available in micro SMD and LLP packages

Applications

n Cell Phones

n PDAs

n Portable Gaming Devices

n Internet Appliances

n Portable DVD/CD/AAC/MP3 players

1% THD+N (LM4857SP)

1% THD+N

Shutdown Current

C compatible interface

OUT

, Stereo Loudspeakers, 4Ω, 5V,

, Stereo Loudspeakers, 8Ω, 5V,

, Stereo Headphones, 32Ω, 5V,

, Mono Earpiece, 32Ω, 5V,

, Stereo Loudspeakers, 8Ω, 3.3V,

, Stereo Headphones, 32Ω, 3.3V,

, Mono Earpiece, 32Ω, 3.3V,

100mW (typ)

495mW (typ)

www.national.com

0.06µA (typ)

75mW (typ)

33mW (typ)

43mW (typ)

1.6W (typ)

1.2W (typ)

June 2005

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