LM4938

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		放大器功率放大器
页数	文件大小	规格书
26页	1630K
描述
Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain

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LM4938 数据手册

February 2005

LM4938

Stereo 2W Audio Power Amplifiers

with DC Volume Control and Selectable Gain

General Description

Key Specifications

n P_Oat 1% THD+N

The LM4938 is a monolithic integrated circuit that provides

DC volume control, and stereo bridged audio power amplifi-

ers capable of producing 2W into 4Ω (Note 1) with less than

1.0% THD or 2.2W into 3Ω (Note 2) with less than 1.0%

THD.

into 3Ω

into 4Ω

into 8Ω

2.2W (typ)

2.0W (typ)

1.3W (typ)

n Single-ended mode - THD+N at 92mW into

Boomer^®audio integrated circuits were designed specifically

to provide high quality audio while requiring a minimum

amount of external components. The LM4938 incorporates a

DC volume control, stereo bridged audio power amplifiers

and a selectable gain or bass boost, making it optimally

suited for multimedia monitors, portable radios, desktop, and

portable computer applications.

32Ω

1.0%(typ)

0.5µA (typ)

n Shutdown current

Features

n Improved click and pop circuitry virtually eliminates

noise during turn on/off transitions

n DC Volume Control Interface

n System Beep Detect

n Stereo switchable bridged/single-ended power amplifiers

n Selectable internal/external gain and bass boost

n Thermal shutdown protection circuitry

n Unity gain stable

The LM4938 features an externally controlled, low-power

consumption shutdown mode, and both a power amplifier

and headphone mute for maximum system flexibility and

performance.

Note 1: When properly mounted to the circuit board, LM4938MH will deliver

2W into 4Ω. See Application Information section Exposed-DAP package

PCB Mounting Considerations for more information.

Note 2: An LM4938MH that has been properly mounted to the circuit board

and forced-air cooled will deliver 2.2W into 3Ω.

Applications

n Flat Panel Displays

n Portable and Desktop Computers

n Multimedia Monitors

n Portable Radios, PDAs, and Portable TVs

Block Diagram

20095601

FIGURE 1. LM4938 Block Diagram

Boomer^®is a registered trademark of NationalSemiconductor Corporation.

DS200956

www.national.com

12 3 4 5 6 7...26

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与LM4938相关器件

型号	品牌	获取价格	描述	数据表
LM4938MH	NSC	获取价格	Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain
LM4938MH/NOPB	TI	获取价格	具有 DC 音量控制和可选增益的立体声 2W 音频功率放大器 \| PWP \| 28 \| -
LM4938MHX	NSC	获取价格	IC 2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO28, TSSOP-28, Audio Control IC
LM4938MHX/NOPB	TI	获取价格	具有 DC 音量控制和可选增益的立体声 2W 音频功率放大器 \| PWP \| 28 \| -
LM494	NSC	获取价格	Pulse Width Modulated Control Circuit
LM4940	NSC	获取价格	6W Streo Audio Power Amplifier
LM4940TS	NSC	获取价格	IC 4.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PSSO9, PLASTIC, TO-263, 9 PIN, Audio/Video Amplifier
LM4940TS/NOPB	TI	获取价格	6W Stereo Audio Power Amplifier
LM4940TS/NOPB	NSC	获取价格	IC 4.2 W, 2 CHANNEL, AUDIO AMPLIFIER, PSSO9, PLASTIC, TO-263, 9 PIN, Audio/Video Amplifier
LM4940TSX	TI	获取价格	6W Stereo Audio Power Amplifier

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