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.