Datasheet > LM4941_07

LM4941_07

更新时间： 2024-11-21 04:20:07

品牌	Logo	应用领域
美国国家半导体 - NSC		放大器射频功率放大器
页数	文件大小	规格书
16页	380K
描述
1.25 Watt Fully Differential Audio Power Amplifier With RF Suppression and Shutdown

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LM4941_07 数据手册

March 2007

LM4941ꢀ

1.25 Watt Fully Differential Audio Power Amplifier With RF

Suppression and Shutdown

General Description

Key Specifications

The LM4941 is a fully differential audio power amplifier pri-

marily designed for demanding applications in mobile phones

and other portable communication device applications. It is

capable of delivering 1.25 watts of continuous average power

to a 8Ω load with less than 1% distortion (THD+N) from a

5V_DCpower supply. The LM4941 does not require output

coupling capacitors or bootstrap capacitors, and therefore is

ideally suited for mobile phone and other small form factor

applications where minimal PCB space is a primary require-

ment.

■ꢀImproved PSRR at 217Hz

■ꢀPower Output, V_DD= 5.0V,

ꢀR_L= 8Ω, 1% THD+N

95dB (typ)

1.25W (typ)

■ꢀPower Output, V_DD= 3.0V,

ꢀR_L= 8Ω, 1% THD+N

430mW (typ)

0.1µA (typ)

■ꢀShutdown Current

Features

The LM4941 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 cir-

cuitry in the LM4941 makes it well-suited for portable appli-

cations in which strong RF signals generated by an antenna

from or a cellular phone or other portable electronic device

may couple audibly into the amplifier.

Improved RF suppression, by up to 20dB over previous

designs in selected applications

■

Fully differential amplification

■

Available in space-saving micro SMD package

Ultra low current shutdown mode

Can drive capacitive loads up to 100pF

Improved pop & click circuitry eliminates noises during

turn-on and turn-off transitions

Other features include a low-power consumption shutdown

mode, internal thermal shutdown protection, and advanced

pop & click circuitry.

2.4 - 5.5V operation

■

No output coupling capacitors, snubber networks or

bootstrap capacitors required

Applications

Mobile phones

■

PDAs

Portable electronic devices

Typical Application

20170366

FIGURE 1. Typical Audio Amplifier Application Circuit

Boomer® is a registered trademark of National Semiconductor Corporation.

201703

www.national.com

12 3 4 5 6 7...16

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与LM4941_07相关器件

型号	品牌	获取价格	描述	数据表
LM4941SD	NSC	获取价格	1.25 Watt Fully Differential Audio Power Amplifier With RF Suppression and Shutdown
LM4941TM	NSC	获取价格	1.25 Watt Fully Differential Audio Power Amplifier With RF Suppression and Shutdown
LM4941TMX	NSC	获取价格	IC 1.54 W, 1 CHANNEL, AUDIO AMPLIFIER, BGA9, MICRO, BGA-9, Audio/Video Amplifier
LM49450	NSC	获取价格	I2S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio Sub-System with Ground Referenced
LM49450	TI	获取价格	Boomer I2S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio Sub-System with Ground Ref
LM49450_15	TI	获取价格	Boomer I2S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio Sub-System with Ground Ref
LM49450SQ	NSC	获取价格	IC 1.2 W, 2 CHANNEL, AUDIO AMPLIFIER, QCC32, 5 X 5 MM, 0.80 MM HEIGHT, LLP-32, Audio/Video
LM49450SQ/NOPB	TI	获取价格	Boomer I2S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio Sub-System with Ground Ref
LM49450SQX	TI	获取价格	IC,AUDIO AMPLIFIER,DUAL,LLCC,28PIN,PLASTIC
LM49450SQX/NOPB	TI	获取价格	Boomer I2S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio Sub-System with Ground Ref

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