●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.
●The LM49250 features a new circuit technology that utilizes a charge pump to generate a negative supply voltage. This allows the headphone outputs to be biased about ground, thereby eliminating the output-coupling capacitors.
●For improved noise immunity, the LM49250 features fully differential left, right and mono inputs. The three inputs can be mixed/multiplexed to any output combination of the loudspeaker, headphone or earpiece amplifiers. The left and right differential inputs can be used as separate single-ended inputs, mixing multiple stereo audio sources. The mixer, volume control, and device mode select are controlled through an I2C compatible interface.
●Output short circuit and thermal overload protection prevent the device from being damaged during fault conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during shutdown.
● 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
●## 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%
●All trademarks are the property of their respective owners.
Part 3D Model
