LM49200, LM49200TLEVAL

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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

interface that allows flexibility in routing and mixing

•

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

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

2

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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.