LM4856ITL datasheet(1/23 Pages) NSC

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LM4856

Integrated Audio Amplifier System

General Description

The LM4856 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

60mW (typ) per channel of continuous average power into

stereo 32

Ω single-ended (SE) loads with 0.5% THD+N, us-

ing a 5V power supply.

The LM4856 features a 32 step digital volume control and

eight distinct output modes. The digital volume control and

output modes are programmed through a two-wire I

2C com-

patible control interface, that allows flexibility in routing and

mixing audio channels.

The LM4856 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

eight external components.

The industry leading micro SMD package only utilizes 2mm

x 2.3mm of PCB space, making the LM4856 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, 60mW into 32

Ω SE

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

60mW (typ) output power with stereo 32

Ω SE loads

n

I

2C 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.

20060732

FIGURE 1. Typical Audio Amplifier Application Circuit

May 2004

DS200607

www.national.com

Số phần tương tự - LM4856ITL

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