LM49250RL Datasheet PDF - TI

●DESCRIPTION

●The LM49250 is a fully integrated audio subsystem designed for stereo cell phone applications. The LM49250 combines a 2.4W/Ch stereo class D speaker amplifiers with a 45mW/Ch stereo ground referenced headphone amplifier, a class AB earpiece amplifier, TI 3D enhancement, volume control, and an input mixer into a single device. The filterless class D

●amplifiers deliver 1.2W/Ch into an 8Ω load with <1% THD+N from a 5V supply.

●FEATURES

●• Output Short Circuit Protection

●• Thermal Overload Protection

●• Stereo Filterless Class D Operation

●• Spread Spectrum Modulation

●• Ground Referenced Headphone Drivers

●• I2C Control Interface

●• 32-Step Input Volume Control

●• Output Volume Control

●• Minimum External Components

●• Click and Pop Suppression

●• Micro-Power Shutdown

●• Available in Space-Saving 36–Bump DSBGA Package

●• Single Supply Operation

●• RF Suppression

●APPLICATIONS

●• Mobile Phones

●• Portable Navigation Devices

●• Portable Media Players

●KEY SPECIFICATIONS

●• Power Output at VDD = 5V Speaker:

●– RL = 4Ω, THD+N ≤ 1%: 1.97W/Ch

●– RL = 4Ω, THD+N ≤ 10%: 2.4W/Ch

●– RL =8Ω, THD+N ≤ 1%: 1.2W/Ch

●• Headphone:

●– RL = 16Ω, THD+N ≤ 1%: 41mW/Ch

●– RL = 32Ω, THD+N ≤ 1%: 45mW/Ch

●• Earpiece:

●– RL = 16Ω, THD+N ≤ 1%: 170mW

●– RL = 32Ω, THD+N ≤ 1%: 90mW

●• Shutdown Current: 0.1μA

●• Efficiency at 5V, 1W into 8Ω: 87%

●• Efficiency at 3.6V, 500mW into 8Ω: 85%