LM49250RL/NOPB

具有接地参考耳机放大器的增强型排放抑制立体声 D 类音频子系统 36-DSBGA -40 to 85

DESCRIPON

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%