1FEATURES

23• E2S Class D Amplifier

• Ground Referenced Headphone Outputs —

Eliminates Output Coupling Capacitors

• I2C Volume and Mode Control

• Mono Earpiece Amplifier

• Flexible Output for Speaker and Headphone

Output

• 20–Bump DSBGA Package

• Soft Enable Function

• “Click and Pop” Suppression Circuitry

• Thermal Shutdown Protection

• Low Supply Current

• Micro-Power Shutdown

KEY SPECIFICATIONS

• Output power at V DD = 5V:

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

(typ)

– Headphone: RL = 32Ω SE, THD+N ≤ 1%:

42mW (typ) ground–

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

(typ)

• Output power at VDD = 3.3V:

– Speaker: RL = 8Ω BTL, THD+N ≤ 1%:

520mW (typ)

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

42mW (typ)

– Earpiece: R L = 8Ω SE, THD+N ≤ 1%: 35mW

(typ)

• Output Offset

– LS Mode: 9mV (typ)

– HP Mode: 1mV (typ)

– Earpiece: 1mV (typ)

• Single Supply Operation (V DD): 2.7 to 5.5V

• I2C Single Supply Operation: 1.7 to 5.5V

APPLICATIONS

• Mobile Phones

• PDAs

• Portable Electronics

DESCRIPTION

The LM49150 is a fully integrated audio subsystem

designed for portable handheld applications such as

cellular phones. Part of TI's PowerWise™ product

family, the LM49150 consumes very low power in the

various modes of operation and still providing great

audio performance. The LM49150 combines a 1.25W

mono E2S (Enhanced Emission Suppression) class D

amplifier, 135mW Class AB earpiece amplifier,

42mW/channel stereo ground reference headphone

amplifiers, volume control, and mixing circuitry into a

single device.

The filterless class D amplifier delivers 1.25W into an

8Ω load with <1% THD+N with a 5V supply. The E2S

class D amplifier features a patented, ultra low EMI

PWM architecture that significantly reduces RF

emissions while preserving audio quality. The

42mW/channel headphone drivers feature TI’s

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 cost.

The LM49150 features a fully differential mono input,

and two single-ended stereo inputs. The three inputs

can be mixed/multiplexed to either the speaker or

headphone amplifiers. Each input channel has an

independent, 32-step digital volume control. The

headphone output stage features an additional, 8-

step gain control, while the speaker output stage has a selectable 6dB or 12dB gain. The mixer, volume

control and device mode select are controlled through

an I2C compatible serial interface.

The LM49150’s superior click and pop suppression

eliminates audible transients on power-up/down and

during shutdown. The LM49150 is available in a ultra-

small 20-bump DSBGA package (2.225mm X

2.644mm).