1FEATURES

23• E2S Class D Amplifier

• Ground Referenced Outputs — Eliminates

Output Coupling Capacitors

• I2C Programmable No Clip Function with Clip

Control

• Voltage Limiter Speaker Protection

• I2C Volume and Mode Control

• Ear Piece Amplifier

• Advanced Click-and-Pop Suppression

• Low Supply Current

• Micro-Power Shutdown

• 20-bump DSBGA Package

APPLICATIONS

• Mobile Phones

• PDAs

• Notebook PCs

• Portable Electronics Devices

• MP3 Players

KEY SPECIFICATIONS

• Output Power at VDD = 3.3V THD+N ≤ 1%

– LS Mode, RL = 8Ω 520mW (Typ)

– HP Mode, R L = 32Ω 40mW (Typ)

• Output Power at VDD = 5V THD+N ≤ 1%

– LS Mode, RL = 8Ω 1.25W (Typ)

– HP Mode, RL = 32Ω 42mW (Typ)

• Output Offset

– LS Mode 15 6mV (Typ)

– HP Mode 15 2mV (Typ)

DESCRIPTION

The LM49151 is a fully integrated audio subsystem

designed for portable handheld applications such as

cellular phones. The LM49151 combines a 1.25W

mono E2S class D amplifier, 125mW Class AB

earpiece driver, 42mW/channel stereo ground

referenced headphone drivers, volume control, input

mixer/multiplexer, and speaker protection into a

single device.

The LM49151 class D speaker amplifier features

Texas Instruments' unique Automatic Level Control

(ALC) that provides both a I2C programmable no-clip

feature with Clip Controls and speaker protection.

The E2S (Enhanced Emission Suppression) class D

amplifier features a patented, ultra low EMI PWM

architecture that significantly reduces RF emissions

while preserving audio quality and efficiency while

delivering 1.25W into an 8Ω load with <1% THD+N

with a 5V supply. The 42mW/channel headphone

drivers feature Texas Instruments' ground referenced

architecture that creates a ground-referenced output

from a single supply, eliminating the need for bulky

and expensive DC-blocking capacitors, saving space

and minimizing system cost.

The LM49151 features separate volume controls for

the loudspeaker and headphone inputs. Mode

selection, shutdown control, and volume are

controlled through an I2C compatible interface. The

LM49151's superior click and pop suppression

eliminates audible transients on power-up/down and

during shutdown.