Datasheet > LM4840

LM4840

更新时间： 2024-11-06 22:51:51

品牌	Logo	应用领域
美国国家半导体 - NSC		复用器放大器功率放大器
页数	文件大小	规格书
19页	789K
描述
Stereo 2W Audio Power Amplifiers with Digital Volume Control and Input Mux

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中文翻译

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LM4840 数据手册

December 2001

LM4840

Stereo 2W Audio Power Amplifiers

with Digital Volume Control and Input Mux

General Description

Key Specifications

n P_Oat 1% THD+N

The LM4840 is a monolithic integrated circuit that provides

digital volume control and stereo bridged audio power am-

plifiers 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 (LM4840LQ, LM4840MH)

into 4Ω (LM4840LQ, LM4840MH)

into 8Ω (LM4840)

2.2W (typ)

2.0W (typ)

1.1W (typ)

n Single-ended mode - THD+N at 85mW into 32Ω

1.0%

Boomer^®audio integrated circuits were designed specifically

to provide high quality audio while requiring a minimum

amount of external components. The LM4840 incorporates a

digital volume control, stereo bridged audio power amplifiers,

an input mux, and a last volume level memory function to

save the volume setting during shutdown. These features

make it optimally suited for multimedia monitors, portable

radios, desktop, and portable computer applications.

(typ)

n Shutdown current

0.2µA (typ)

Features

n PC98 and PC99 Compliant

n Digital Volume Control Interface

n System Beep Detect

n Stereo switchable bridged/single-ended power amplifiers

n “Click and pop” suppression circuitry

n Thermal shutdown protection circuitry

n Input Mux

n Capless headphone drivers

n Last volume memory from shutdown

The LM4840 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, the LM4840LQ and

LM4840MH will deliver 2W into 4Ω. The LM4840MT will deliver 1.1W into 8Ω.

See the Application Information section LM4840LQ and for LM4840MH us-

age information.

Note 2: An LM4840LQ and LM4840MH that have been properly mounted to

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

Applications

n Portable and Desktop Computers

n Multimedia Monitors

n Portable Radios, PDAs, and Portable TVs

Connection Diagram

LLP Package

DS200104-35

Top View

Order Number LM4840LQ

See NS Package Number LQA028A for Exposed-DAP LLP

Boomer^®is a registered trademark of NationalSemiconductor Corporation.

DS200104

www.national.com

12 3 4 5 6 7...19

中文翻译

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与LM4840相关器件

型号	品牌	获取价格	描述	数据表
LM4840LQ	NSC	获取价格	Stereo 2W Audio Power Amplifiers with Digital Volume Control and Input Mux
LM4840LQ/NOPB	TI	获取价格	2 CHANNEL(S), VOLUME CONTROL CIRCUIT, QCC28, LLP-28
LM4840LQ/NOPB	ROCHESTER	获取价格	2 CHANNEL(S), VOLUME CONTROL CIRCUIT, QCC28, LLP-28
LM4840LQX	TI	获取价格	2 CHANNEL(S), VOLUME CONTROL CIRCUIT, QCC28
LM4840LQX/NOPB	TI	获取价格	2 CHANNEL(S), VOLUME CONTROL CIRCUIT, QCC28, LLP-28
LM4840MH	NSC	获取价格	Stereo 2W Audio Power Amplifiers with Digital Volume Control and Input Mux
LM4840MH/NOPB	TI	获取价格	2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO28, TSSOP-28
LM4840MHX	TI	获取价格	2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO28, TSSOP-28
LM4840MHX/NOPB	TI	获取价格	2 CHANNEL(S), VOLUME CONTROL CIRCUIT, PDSO28, TSSOP-28
LM4840MT	NSC	获取价格	Stereo 2W Audio Power Amplifiers with Digital Volume Control and Input Mux

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