Datasheet > LM4884MH

LM4884MH

更新时间： 2024-11-21 04:18:31

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 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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与LM4884MH相关器件

型号	品牌	获取价格	描述	数据表
LM4884MH/NOPB	TI	获取价格	2.6W, 2 CHANNEL, AUDIO AMPLIFIER, PDSO20, TSSOP-20
LM48860	NSC	获取价格	Ground-Referenced, Ultra Low Noise, Fixed Gain Stereo Headphone Amplifier
LM48860TL	NSC	获取价格	Ground-Referenced, Ultra Low Noise, Fixed Gain Stereo Headphone Amplifier
LM48860TLX	TI	获取价格	IC,AUDIO AMPLIFIER,SINGLE,BGA,12PIN,PLASTIC
LM48861	NSC	获取价格	Ground-Referenced, Ultra Low Noise, Stereo Headphone Amplifier
LM48861TM	NSC	获取价格	Ground-Referenced, Ultra Low Noise, Stereo Headphone Amplifier
LM48861TMX	TI	获取价格	IC,AUDIO AMPLIFIER,SINGLE,BGA,12PIN,PLASTIC
LM48861TMX/NOPB	TI	获取价格	Ground-Referenced, Ultra Low Noise, Stereo Headphone Amplifier 12-DSBGA -40 to 85
LM4888	NSC	获取价格	Dual 2.1W Audio Amplifier Plus Stereo Headphone & 3D Enhancement
LM4888_06	NSC	获取价格	Dual 2.1W Audio Amplifier Plus Stereo Headphone & 3D Enhancement

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