1FEATURES

2• RF Immunity

• Selectable OCL/SE Headphone Drivers

• 32 Step Volume Control

• Click and Pop Suppression

• Independent Speaker and Headphone Gain

Settings

• Minimum External Components

• Thermal Over Load Protection

• Micro-power Shutdown

• Space Saving 16–bump DSBGA Package

• Thermal Shutdown Protection

• Micro-power Shutdown

• I2C Control Interface

APPLICATIONS

• Mobile Phones

• PDAs

• Portable Electronics

KEY SPECIFICATIONS

• Output Power at VDD = 5V:

– Speaker: RL = 8Ω BTL, THD+N ≤ 1%: 1.3W

(typ)

– Headphone: RL = 32Ω, SE, THD+N ≤ 1%:

85mW (typ)

• Output Power at VDD = 3.6V:

– Speaker: RL = 8Ω, BTL, THD+N ≤ 1%:

632mW (typ)

• Output Power at VDD = 3.3V:

– Speaker: RL = 8Ω, BTL, THD+N ≤ 1%:

540mW (typ)

– Headphone: RL = 32Ω, OCL/SE, THD+N ≤

1%: 35mW (typ)

DESCRIPTION

The LM49120 is a compact audio subsystem

designed for portable handheld applications such as

cellular phones. The LM49120 combines a mono

1.3W speaker amplifier, stereo 85mW/ch output

capacitorless headphone amplifier, 32 step volume

control, and an input mixer/multiplexer into a single 16–bump DSBGA package.

The LM49120 has three input channels: two singleended

stereo inputs and a differential mono input.

Each input features a 32-step digital volume control.

The headphone output stage features an 8 step (-

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

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

The digital volume control and mode control are

programmed through a two-wire I2C compatible

interface.