LM4855 datasheet(1/24 Pages) NSC

Nome de Peças	LM4855

Descrição Electrónicos	Boomer AUDIO POWER AMPLIFIER Integrated Audio Amplifier System

PDF	24 Pages

Scroll/Zoom	100%

Fabricante Electrônico	NSC [National Semiconductor (TI)]

Página de início	http://www.national.com

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LM4855

Integrated Audio Amplifier System

General Description

The LM4855 is an audio power amplifier system capable of

delivering 1.1W (typ) of continuous average power into a

mono 8

Ω bridged-tied load (BTL) with 1% THD+N and

115mW (typ) per channel of continuous average power into

stereo 32

Ω BTL loads with 0.5% THD+N, using a 5V power

supply.

The LM4855 features a 32 step digital volume control and

eight distinct output modes. The digital volume control and

output modes are programmed through a three-wire SPI

serial control interface, that allows flexibility in routing and

mixing audio channels.

The LM4855 is designed for cellular phone, PDA, and other

portable handheld applications. It delivers high quality output

power from a surface-mount package and requires only six

external components.

The industry leading micro SMD package only utilizes 2mm

x 2.3mm of PCB space, making the LM4855 the most space

efficient audio sub system available today.

Key Specifications

n

THD+N at 1kHz, 1.1W into 8

Ω BTL

1.0% (typ)

n

THD+N at 1kHz, 115mW into 32

Ω BTL

0.5% (typ)

n

Single Supply Operation

2.6 to 5.0V

Features

n

1.1W (typ) output power with 8

Ω mono BTL load

n

115mW (typ) output power with stereo 32

Ω BTL loads

n

SPI programmable 32 step digital volume control

n

Eight distinct output modes

n

micro-SMD and LLP surface mount packaging

n

"Click and Pop" suppression circuitry

n

Thermal shutdown protection

n

Low shutdown current (0.1uA, typ)

Applications

n

Moblie Phones

n

PDAs

Typical Application

Boomer® is a registered trademark of National Semiconductor Corporation.

200395D1

FIGURE 1. Typical Audio Amplifier Application Circuit

November 2002

DS200395

www.national.com

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LM4855 Folha de dados(PDF) 1 Page - National Semiconductor (TI)

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