LM4841 datasheet(1/31 Pages) NSC

部件名	LM4841

功能描述	Stereo 2W Amplifiers with DC Volume Control, Transient Free Outputs, and Cap-less Headphone Drive

PDF	31 Pages

Scroll/Zoom	100%

制造商	NSC [National Semiconductor (TI)]

网页	http://www.national.com

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LM4841

Stereo 2W Amplifiers with DC Volume Control,

Transient Free Outputs, and Cap-less Headphone Drive

General Description

The LM4841 is a monolithic integrated circuit that provides

DC volume control and stereo bridged audio power amplifi-

ers capable of producing 2W into 4

Ω (Note 1) or 2.2W into

3

Ω (Note 2) with less than 1.0% THD.

The LM4841 uses advanced, latest generation circuitry to

eliminate all traces of clicks and pops when the supply

voltages is first applied. The amplifier has a headphone-

amplifier-select input pin that is used to switch the amplifiers

from bridge to single-ended mode for driving headphones. A

new circuit topology eliminates headphone output coupling

capacitors (patent pending).

Boomer® audio integrated circuits are designed specifically

to provide high quality audio while requiring a minimum

amount of external components. The LM4841 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.

The LM4841 features an externally controlled, low-power

consumption shutdown mode (Shutdown Low), and both a

power amplifier and headphone mute for maximum system

flexibility and performance.

Note 1: When properly mounted to the circuit board, LM4841MH and

LM4841LQ will deliver 2W into 4

Ω. The LM4841MT will deliver 1.1W into 8Ω.

See the Application Information section for LM4841MH usage information.

Note 2: An LM4841MH that has been properly mounted to the circuit board

and forced-air cooled will deliver 2.2W into 3

Ω.

Key Specifications

n

P

O at 1% THD+N

n

into 3

Ω (MH and LQ)

2.2W (typ)

n

into 4

Ω ( MH and LQ)

2.0W (typ)

n

into 8

Ω (MT, MH, and LQ)

1.1W (typ)

n

Single-ended THD+N at 85mW into 32

Ω

1.0%(typ)

n

Shutdown current

0.7µA (typ)

Features

n

Stereo headphone amplifier mode that eliminates the

Output Coupling Capacitors (patent pending)

n

Acoustically Enhanced DC Volume Control Taper

n

System Beep Detect

n

Stereo switchable bridged/single-ended power amplifiers

n

Selectable internal/external gain and bass boost

n

Advanced “click and pop” suppression circuitry

n

Thermal shutdown protection circuitry

Applications

n

Portable and Desktop Computers

n

Multimedia Monitors

n

Portable Radios, PDAs, and Portable TVs

Connection Diagrams

TSSOP Package

20028002

Top View

Order Number LM4841MT or LM4841MH

See NS Package Number MTC28 for TSSOP and MXA28A for Exposed-DAP TSSOP

Boomer® is a registered trademark of National Semiconductor Corporation.

August 2002

DS200280

www.national.com

类似零件编号 - LM4841

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