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LM49250RLX/NOPB
Enhanced Emissions Suppression Stereo Class D Audio Sub-System w/ Ground Referenced Headphone Amp
LM49250
www.ti.com SNAS406C –JANUARY 2008–REVISED MAY 2013
LM49250 Enhanced Emissions Suppression Stereo Class Audio Sub-System with Ground Referenced Headphone Amplifier and Mono Earpiece
Checkfor Samples: LM49250
1FEATURES DESCRIPTIONThe LM49250isa fully integrated audio subsystem
Output Short Circuit Protection designed for stereo cell phone applications. The
• Thermal Overload Protection LM49250 combinesa 2.4W/Ch stereo class D
• Stereo Filterless ClassD Operation speaker amplifiers witha 45mW/Ch stereo ground
referenced headphone amplifier,a class AB earpiece
• Spread Spectrum Modulation amplifier,TI 3D enhancement, volume control, andan
• Ground Referenced Headphone Drivers input mixer intoa single device. The filterless classD
•I2C Control Interface amplifiers deliver 1.2W/Ch into an 8Ω load with <1%
THD+N froma 5V supply.
• 32-Step Input Volume Control Output Volume Control The LM49250 featuresa new circuit technology that
utilizesa charge pumpto generatea negative supply
• Minimum External Components voltage. This allows the headphone outputsto be
• Click and Pop Suppression biased about ground, thereby eliminating the output-
• Micro-Power Shutdown coupling capacitors.
Availablein Space-Saving 36–Bump DSBGA For improved noise immunity, the LM49250 features
Package fully differential left, right and mono inputs. The three
Single Supply Operation inputs can be mixed/multiplexed to any output
combination of the loudspeaker, headphone or
• RF Suppression earpiece amplifiers. The left and right differential
inputs can be used as separate single-ended inputs,
APPLICATIONS mixing multiple stereo audio sources. The mixer,
Mobile Phones volume control, and device mode select are
controlled throughanI2C compatible interface.
• Portable Navigation Devices Portable Media Players
KEY SPECIFICATIONS Power Outputat VDD= 5V Speaker:≤ 1%: 1.97W/Ch≤ 10%:≤ 1%: 41mW/Ch 45mW/Ch RL= 16Ω, 8Ω: 85%
