Datasheet > LM4884MH

LM4884MH

更新时间： 2024-01-28 11:59:46

品牌	Logo	应用领域
美国国家半导体 - NSC		商用集成电路音频放大器射频
页数	文件大小	规格书
22页	1185K
描述
2.1W Differential Input, BTL Output Stereo Audio Amplifier with RF Suppression and Shutdown

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LM4884MH 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
包装说明：	TSSOP, TSSOP20,.25	Reach Compliance Code：	compliant
风险等级：	5.83	商用集成电路类型：	AUDIO AMPLIFIER
JESD-30 代码：	R-PDSO-G20	JESD-609代码：	e3
湿度敏感等级：	1	功能数量：	2
端子数量：	20	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	TSSOP	封装等效代码：	TSSOP20,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
电源：	5 V	认证状态：	Not Qualified
子类别：	Audio/Video Amplifiers	最大压摆率：	12 mA
表面贴装：	YES	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	0.635 mm	端子位置：	DUAL
Base Number Matches：	1

LM4884MH 数据手册

April 2005

LM4884

2.1W Differential Input, BTL Output Stereo Audio

Amplifier with RF Suppression 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 LM4884 features differential stereo inputs, BTL (bridge-

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

The LM4884 also features proprietary internal circuitry that

suppresses the coupling of RF signals into the chip. This is

important because certain types of RF signals (such as

GSM) can couple into audio amplifiers in such a way that

part of the signal is heard through the speaker. The RF

suppression circuitry in the LM4884 makes it well-suited for

notebook and portable applications in which strong RF sig-

nals generated by an antenna from a PC wireless card or a

cellular phone may couple audibly into the amplifier.

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

Features

n Improved RF immunity, by up to 28dB over previous

designs (such as the LM4874) in selected applications.

n Fully differential input and output

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

Operating on a single 5V supply, the LM4884 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

LM4884’s gain is selected using two digital inputs. The nomi-

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

n Available in space-saving exposed-DAP TSSOP

package

Other features of the LM4884 are that it delivers high-quality

output power from a surface-mount package, requires few

external components, has an active-low micropower shut-

down mode input, and has thermal shutdown protection.

Applications

n Notebook computers

n PDAs

Key Specifications

n Portable electronic devices

BTL output power

R_L= 3Ω, V_DD= 5.0V, and THD+N = 1%

BTL output power

2.1W (typ)

1.9W (typ)

R_L= 4Ω, V_DD= 5.0V, and THD+N = 1%

Connection Diagram

Top View

20116302

Order Number LM4884MH

See NS Package Number MXA20A for Exposed-DAP TSSOP

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

DS201163

www.national.com

12 3 4 5 6 7...22

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