LM49120, LM49120TLEVAL

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SNAS431C – JUNE 2008 – REVISED MAY 2013

LM49120

Audio Sub-System with Mono Class AB

Loudspeaker Amplifier and Stereo OCL/SE Headphone Amplifier

Check for Samples: LM49120, LM49120TLEVAL

1

FEATURES

DESCRIPTION

The

LM49120

is

a

compact

audio

subsystem

2

•

RF Immunity

designed for portable handheld applications such as

•

Selectable OCL/SE Headphone Drivers

cellular phones. The LM49120 combines a mono

•

32 Step Volume Control

1.3W speaker amplifier, stereo 85mW/ch output

capacitorless headphone amplifier, 32 step volume

•

Click and Pop Suppression

control, and an input mixer/multiplexer into a single

•

Independent Speaker and Headphone Gain

16–bump DSBGA package.

Settings

The LM49120 has three input channels: two single-

•

Minimum External Components

ended stereo inputs and a differential mono input.

•

Thermal Over Load Protection

Each input features a 32-step digital volume control.

•

Micro-power Shutdown

The headphone output stage features an 8 step (-

18dB – 0dB) attenuator, while the speaker output

•

Space Saving 16–bump DSBGA Package

stage has two selectable (0dB/+6dB) gain settings.

•

Thermal Shutdown Protection

The digital volume control and mode control are

•

Micro-power Shutdown

programmed through a two-wire I2C compatible

interface.

•

I2C Control Interface

APPLICATIONS

•

Mobile Phones

•

PDAs

•

Portable Electronics

KEY SPECIFICATIONS

•

Output Power at VDD = 5V:

–

Speaker: RL = 8

Ω BTL, THD+N ≤ 1%: 1.3W

(typ)

–

Headphone: RL = 32

Ω, SE, THD+N ≤ 1%:

85mW (typ)

•

Output Power at VDD = 3.6V:

–

Speaker: RL = 8

Ω, BTL, THD+N ≤ 1%:

632mW (typ)

•

Output Power at VDD = 3.3V:

–

Speaker: RL = 8

Ω, BTL, THD+N ≤ 1%:

540mW (typ)

–

Headphone: RL = 32

Ω, OCL/SE, THD+N ≤

1%: 35mW (typ)

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2

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PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.