LM49200, LM49200TLEVAL

www.ti.com

SNAS459A – MAY 2009 – REVISED APRIL 2013

LM49200

Stereo Class AB Audio Subsystem with a True

Ground Headphone Amplifier

Check for Samples: LM49200, LM49200TLEVAL

1

FEATURES

APPLICATIONS

2

•

Differential Mono Input and Stereo Single-

•

Portable Electronic Devices

Ended Input

•

Mobile Phones

•

32-Step Digital Volume Control (-80 to +18dB)

•

PDAs

•

Three Independent Volume Channels (Left,

Right, Mono)

DESCRIPTION

The LM49200 is a fully integrated audio subsystem

•

Separate Headphone Volume Control

with a stereo power amplifier capable of delivering

•

Flexible Output for Speaker and Headphone

500mW of continuous average power per channel

Output

into 8

Ω with 1% THD+N using a 3.3V supply. The

•

True Ground Headphone Amplifier Eliminates

LM49200 includes a separate stereo headphone

Large DC Blocking Capacitors Reducing PCB

amplifier that can deliver 35mW per channel into

Space and Cost

32

Ω.

•

Receiver Pass-Through Capability

The LM49200 has three input channels. A pair of

single-ended inputs and a fully differential input

•

Soft Enable Function

channel. The LM49200 features a 32-step digital

•

RF Immunity Topology

volume control on the input stage and an 8-step

•

“Click and Pop” Suppression Circuitry

digital volume control on the headphone output stage.

•

Thermal Shutdown Protection

The digital volume control and output modes are

•

Micro-Power Shutdown

programmed through a two-wire I2C compatible

interface that allows flexibility in routing and mixing

•

I2C Control Interface

audio channels.

•

Available in Space-Saving DSBGA Package

The LM49200 is designed for cellular phone, PDA,

KEY SPECIFICATIONS

and other portable handheld applications. The high

level of integration minimizes external components.

•

Supply Voltage (VDD): 2.7V

≤ VDD ≤ 5.5V

The True Ground headphone amplifier eliminates the

•

I2C Supply Voltage: 1.7V

≤ I2CVDD ≤ 5.5V

physically

large

DC

blocking

output

capacitors

reducing required board space and reducing cost.

•

Output power at VDD = 5V, 1% THD+N

–

RL = 8

Ω speaker: 1.25W (typ)

–

RL = 32

Ω headphone: 38mW (typ)

•

Output power at VDD = 3.3V, 1% THD+N

–

RL = 8

Ω speaker: 520W (typ)

–

RL = 32

Ω headphone: 38mW (typ)

•

PSRR:

–

VDD = 3.3V, 217Hz ripple, Mono In: 95dB

(typ)

•

Shutdown power supply current 0.02

μA (typ)

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009–2013, 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.