1FEATURES

2• Differential Mono Input and Stereo Single-

Ended Input

• 32-Step Digital Volume Control (-80 to +18dB)

• Three Independent Volume Channels (Left,

Right, Mono)

• Separate Headphone Volume Control

• Flexible Output for Speaker and Headphone

Output

• True Ground Headphone Amplifier Eliminates

Large DC Blocking Capacitors Reducing PCB

Space and Cost

• Receiver Pass-Through Capability

• Soft Enable Function

• RF Immunity Topology

• “Click and Pop” Suppression Circuitry

• Thermal Shutdown Protection

• Micro-Power Shutdown

• I2C Control Interface

• Available in Space-Saving DSBGA Package

KEY SPECIFICATIONS

• Supply Voltage (VDD): 2.7V ≤ VDD ≤ 5.5V

• I2C Supply Voltage: 1.7V ≤ I2CVDD ≤ 5.5V

• Output power at VDD = 5V, 1% THD+N

– RL = 8Ω speaker: 1.25W (typ)

– RL = 32Ω headphone: 38mW (typ)

• Output power at VDD = 3.3V, 1% THD+N

– RL = 8Ω speaker: 520W (typ)

– RL = 32Ω headphone: 38mW (typ)

• PSRR:

– VDD = 3.3V, 217Hz ripple, Mono In: 95dB

(typ)

• Shutdown power supply current 0.02μA (typ)

APPLICATIONS

• Portable Electronic Devices

• Mobile Phones

• PDAs

DESCRIPTION

The LM49200 is a fully integrated audio subsystem

with a stereo power amplifier capable of delivering

500mW of continuous average power per channel into 8Ω with 1% THD+N using a 3.3V supply. The

LM49200 includes a separate stereo headphone

amplifier that can deliver 35mW per channel into

32Ω.

The LM49200 has three input channels. A pair of

single-ended inputs and a fully differential input

channel. The LM49200 features a 32-step digital

volume control on the input stage and an 8-step

digital volume control on the headphone output stage.

The digital volume control and output modes are

programmed through a two-wire I2C compatible

interface that allows flexibility in routing and mixing

audio channels.

The LM49200 is designed for cellular phone, PDA,

and other portable handheld applications. The high

level of integration minimizes external components. The True Ground headphone amplifier eliminates the

physically large DC blocking output capacitors

reducing required board space and reducing cost.