LM49150, LM49150TLEVAL

www.ti.com

SNAS439C – AUGUST 2008 – REVISED MAY 2013

LM49150

Mono Class D Audio Subsystem with Earpiece

Driver and Stereo Ground Referenced Headphone Amplifiers

Check for Samples: LM49150, LM49150TLEVAL

1

FEATURES

APPLICATIONS

23

•

E2S Class D Amplifier

•

Mobile Phones

•

Ground Referenced Headphone Outputs —

•

PDAs

Eliminates Output Coupling Capacitors

•

Portable Electronics

•

I2C Volume and Mode Control

DESCRIPTION

•

Mono Earpiece Amplifier

The LM49150 is a fully integrated audio subsystem

•

Flexible Output for Speaker and Headphone

designed for portable handheld applications such as

Output

cellular phones. Part of TI's PowerWise™ product

•

20–Bump DSBGA Package

family, the LM49150 consumes very low power in the

various modes of operation and still providing great

•

Soft Enable Function

audio performance. The LM49150 combines a 1.25W

•

“Click and Pop” Suppression Circuitry

mono E2S (Enhanced Emission Suppression) class D

•

Thermal Shutdown Protection

amplifier,

135mW

Class

AB

earpiece

amplifier,

•

Low Supply Current

42mW/channel stereo ground reference headphone

amplifiers, volume control, and mixing circuitry into a

•

Micro-Power Shutdown

single device.

KEY SPECIFICATIONS

The filterless class D amplifier delivers 1.25W into an

8

Ω load with <1% THD+N with a 5V supply. The E2S

•

Output power at VDD = 5V:

class D amplifier features a patented, ultra low EMI

–

Speaker: RL = 8Ω BTL, THD+N ≤ 1%: 1.25W

PWM architecture that significantly reduces RF

(typ)

emissions

while

preserving

audio

quality.

The

42mW/channel

headphone

drivers

feature

TI’s

–

Headphone: RL = 32Ω SE, THD+N ≤ 1%:

ground referenced architecture that creates a ground-

42mW (typ)

referenced output from a single supply, eliminating

–

Earpiece: RL = 8Ω SE, THD+N ≤ 1%: 135mW

the need for bulky and expensive DC-blocking

(typ)

capacitors, saving space and minimizing cost.

•

Output power at VDD = 3.3V:

The LM49150 features a fully differential mono input,

–

Speaker: RL = 8Ω BTL, THD+N ≤ 1%:

and two single-ended stereo inputs. The three inputs

520mW (typ)

can be mixed/multiplexed to either the speaker or

headphone amplifiers. Each input channel has an

–

Headphone: RL = 32Ω BTL, THD+N ≤ 1%:

independent, 32-step digital volume control. The

42mW (typ)

headphone output stage features an additional, 8-

–

Earpiece: RL = 8Ω SE, THD+N ≤ 1%: 35mW

step gain control, while the speaker output stage has

(typ)

a selectable 6dB or 12dB gain. The mixer, volume

•

Output Offset

control and device mode select are controlled through

an I2C compatible serial interface.

–

LS Mode: 9mV (typ)

–

HP Mode: 1mV (typ)

The LM49150’s superior click and pop suppression

eliminates audible transients on power-up/down and

–

Earpiece: 1mV (typ)

during shutdown. The LM49150 is available in a ultra-

•

Single Supply Operation (VDD): 2.7 to 5.5V

small

20-bump

DSBGA

package

(2.225mm

X

•

I2C Single Supply Operation: 1.7 to 5.5V

2.644mm).

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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

PowerWise is a trademark of Texas Instruments.

3

All other trademarks are the property of their respective owners.

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.