Datasheet > LM4857ITL

LM4857ITL

更新时间： 2024-01-26 16:52:20

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
38页	1511K
描述
Stereo 1.2W Audio Sub-system with 3D Enhancement

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LM4857ITL 数据手册

June 2004

LM4857

Stereo 1.2W Audio Sub-system with 3D Enhancement

General Description

Key Specifications

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 I²C compatible interface. Other fea-

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

mal shutdown protection.

P_OUT, Stereo Loudspeakers, 4Ω, 5V,

1% THD+N (LM4857SP)

1.6W (typ)

1.2W (typ)

P_OUT, Stereo Loudspeakers, 8Ω, 5V,

1% THD+N

P_OUT, Stereo Headphones, 32Ω, 5V,

1% THD+N

75mW (typ)

100mW (typ)

495mW (typ)

33mW (typ)

P_OUT, Mono Earpiece, 32Ω, 5V,

1% THD+N

P_OUT, Stereo Loudspeakers, 8Ω, 3.3V,

1% THD+N

P_OUT, Stereo Headphones, 32Ω, 3.3V,

1% THD+N

Boomer audio power amplifiers are designed specifically to

provide high quality output power with a minimal amount of

external components.

P_OUT, Mono Earpiece, 32Ω, 3.3V,

1% THD+N

43mW (typ)

0.06µA (typ)

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

28–lead LLP package.

Shutdown Current

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 I²C compatible interface

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

Boomer^®is a registered trademark of National Semiconductor Corporation.

DS200797

www.national.com

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