LM4840LQ National Semiconductor, LM4840LQ Datasheet

LM4840LQ

Manufacturer Part Number

LM4840LQ

Description

Stereo 2W Audio Power Amplifiers with Digital Volume Control and Input Mux

Manufacturer

National Semiconductor

Datasheet

1.LM4840LQ.pdf (19 pages)

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LM4840

Stereo 2W Audio Power Amplifiers

with Digital Volume Control and Input Mux

General Description

The LM4840 is a monolithic integrated circuit that provides

digital volume control and stereo bridged audio power am-

plifiers capable of producing 2W into 4

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

THD.

Boomer

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.

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 4 . The LM4840MT will deliver 1.1W into 8 .

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 3 .

Connection Diagram

Boomer

is a registered trademark of NationalSemiconductor Corporation.

audio integrated circuits were designed specifically

See NS Package Number LQA028A for Exposed-DAP LLP

DS200104

(Note 1) with less

Order Number LM4840LQ

LLP Package

Top View

Key Specifications

n P

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

n Shutdown current

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

Applications

n Portable and Desktop Computers

n Multimedia Monitors

n Portable Radios, PDAs, and Portable TVs

(typ)

into 3

into 4

into 8

at 1% THD+N

DS200104-35

(LM4840LQ, LM4840MH)

(LM4840)

December 2001

www.national.com

0.2µA (typ)

2.2W (typ)

2.0W (typ)

1.1W (typ)

1.0%

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