LM4842 National Semiconductor, LM4842 Datasheet

LM4842

Manufacturer Part Number

LM4842

Description

Stereo 2W Amplifiers with DC Volume Control Transient Free Outputs/ and Cap-less Headphone Drive

Manufacturer

National Semiconductor

Datasheet

1.LM4842.pdf (31 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

LM4842LQ

Manufacturer:

NS/国半

Quantity:

20 000

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LM4842

Stereo 2W Amplifiers with DC Volume Control,

Transient Free Outputs, and Cap-less Headphone Drive

General Description

The LM4842 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) or 2.2W into

3Ω (Note 2) with less than 1.0% THD+N.

Boomer

to provide high quality audio while requiring a minimum

amount of external components. The LM4842 incorporates a

DC volume control, stereo bridged audio power amplifiers,

new cap-less headphone driver circuit (patent pending), se-

lectable gain or bass boost, and an input mux making it

optimally suited for multimedia monitors, portable radios,

desktop, and portable computer applications.

The LM4842 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, the LM4842MH will

deliver 2W into 4Ω. The LM4842MT will deliver 1.1W into 8Ω. See the

Application Information section for LM4842MH usage information.

Note 2: An LM4842MH that has been properly mounted to the circuit board

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

Connection Diagrams

Boomer

is a registered trademark of NationalSemiconductor Corporation.

audio integrated circuits were designed specifically

See NS Package Number MXA28A for Exposed-DAP TSSOP

See NS Package Number MTC28 for TSSOP

DS200281

Order Number LM4842MT

Order Number LM4842MH

TSSOP Package

Top View

Key Specifications

n P

n Single-ended THD+N at 85mW into 32Ω

n Shutdown current (Shutdown Low)

Features

n Stereo headphone amplifier mode that eliminates the

n Advanced “click and pop” suppression circuitry

n Acoustically Enhanced DC Volume Control Taper

n 2 Channel Stereo Input MUX

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

Applications

n Portable and Desktop Computers

n Multimedia Monitors

n Portable Radios, PDAs, and Portable TVs

Output Coupling Capacitors (patent pending)

into 3Ω (MH and LQ)

into 4Ω (MH and LQ)

into 8Ω (MT, MH, and LQ)

at 1% THD+N

20028102

September 2002

www.national.com

0.2µA(typ)

2.2W(typ)

2.0W(typ)

1.1W(typ)

1.0%(typ)

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