Datasheet > LM4851

LM4851

更新时间： 2024-11-08 22:51:51

品牌	Logo	应用领域
美国国家半导体 - NSC		音频放大器
页数	文件大小	规格书
22页	1123K
描述
Integrated Audio Amplifier System

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LM4851 数据手册

December 2002

LM4851

Integrated Audio Amplifier System

General Description

Key Specifications

n THD+N at 1kHz, 1.5W into 4Ω BTL (LQ)

n THD+N at 1kHz, 1.1W into 8Ω BTL

n THD+N at 1kHz, 115mW into 32Ω BTL

n Single Supply Operation

1% (typ)

0.5% (typ)

2.6 to 5.0V

The LM4851 is an audio power amplifier system capable of

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

mono 8Ω bridged-tied load (BTL) with 1% THD+N and

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

stereo 32Ω BTL loads with 0.5% THD+N, using a 5V power

supply.

Features

The LM4851 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 LM4851 has 3 inputs: one pair

for a two-channel stereo signal and the third for a single-

channel mono input.

n Mono 1.1W (typ) and stereo 115mW (typ) output

n SPI programmable 32 step digital volume control

(-40.5dB to +6dB)

n Eight distinct SPI programmable output modes

n micro-SMD and LLP surface mount packaging

n “Click and pop” suppression circuitry

n Thermal shutdown protection

The LM4851 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 five

external components.

n Low shutdown current (0.1µA, typ)

Applications

n Mobile phones

n PDAs

The industry leading micro SMD package utilizes only 2mm

x 2.3mm of PCB space, making the LM4851 the most space

efficient audio sub system available today.

Typical Application

20040831

FIGURE 1. Typical Audio Amplifier Application Circuit

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

DS200408

www.national.com

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