LM49250RL

• Output short-circuit protection
• Thermal overload protection
• Stereo filterless Class D operation
• Spread Spectrum Modulation
• Grounding reference headphone driver
• I 2 C control interface
• 32-step input volume control
• Output volume control
• Minimal external components
• Click inhibition
• Micropower shutdown
• Space-saving 36-bump μSMD packages available
• Single power supply
• RF suppression

illustrate

LM49250 audio subsystem designed for a fully integrated stereo phone application. LM49250 combines 45mW/Ch stereo ground with a 2.4W/Ch stereo Class D speaker amplifier, headphone amplifier, Class AB headphone amplifier, national 3D boost, volume control, input mixer referenced to a single device. 无滤波器D类放大器可为8Ω负载

LM49250 features a new circuit technology that uses a charge pump to generate a negative supply voltage. This results in a bias in the output of the headphones, eliminating the output coupling capacitor.

To improve anti-interference, LM49250 functions are fully differential left, right and mono inputs. Three inputs that can mix/duplicate output combinations from any speaker, headphone, or earpiece amplifier. Left, right differential inputs can be used as independent single-ended inputs for multiple stereo audio sources to mix. Mixer, volume control and device mode selection control, via I 2 C compatible interface.

Output short-circuit and thermal overload protection prevent damage to equipment under fault conditions. Advanced click suppression eliminates audible transient noise when power-up/down and off.

Key specifications:

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• mobile phone
• Portable navigation device
• Portable media player