Datasheet > LM4874

LM4874

更新时间： 2024-11-03 22:51:39

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
21页	866K
描述
2.1W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown

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LM4874 数据手册

August 2002

LM4874

2.1W Differential Input, BTL Output Stereo Audio

Amplifier with Selectable Gain and Shutdown

General Description

BTL output power

R_L= 8Ω, V_DD= 5.0V, and THD+N = 1%

Micropower shutdown current

1.2W (typ)

0.1µA (typ)

62dB (typ)

The LM4874 features differential stereo inputs, BTL (bridge-

tied load) outputs, and four externally selectable fixed gains.

Operating on a single 5V supply, the LM4874 delivers 1.2W,

1.9W, or 2.1W (typ) of output power to an 8Ω, 4Ω, or 3Ω BTL

load (Note 1), respectively, with less than 1% THD+N. The

LM4874’s gain is selected using two digital inputs. The nomi-

nal gain values are 6dB, 10dB, 15.6dB, and 21.6dB.

PSRR ( 1kHz, V_DD= 5V, (Fig.1))

Features

n Fully differential input and output

The LM4874 is designed for notebook and other handheld

portable applications. It delivers high quality output power

from a surface-mount package and requires few external

components.

n Internal gain set: 6dB, 10dB, 15.6dB, and 21.6dB

n Improved ’click and pop’ suppression

n Thermal shutdown protection circuit

n Ultra low current micropower shutdown mode

n 3.0V to 5.5V operation

Other features include an active-low micropower shutdown

mode input and thermal shutdown protection.

n Available in space-saving exposed-DAP TSSOP

package

Key Specifications

BTL output power

Applications

n Notebook computers

n PDAs

R_L= 3Ω, V_DD= 5.0V, and THD+N = 1%

BTL output power

2.1W (typ)

1.9W (typ)

n Portable electronic devices

R_L= 4Ω, V_DD= 5.0V, and THD+N = 1%

Connection Diagram

Top View

20046902

Order Number LM4874MH

See NS Package Number MXA20A for Exposed-DAP TSSOP

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

DS200469

www.national.com

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