LM49150中文资料具有集成式 135mW 耳机放大器和 42mW 耳机放大器的 1.25W 单声道 D 类音频放大器数据手册TI规格书

描述 Description

The LM49150 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. Part of TI's PowerWise product family, the LM49150 consumes very low power in the various modes of operation and still providing great audio performance. The LM49150 combines a 1.25W mono E2S (Enhanced Emission Suppression) class D amplifier, 135mW Class AB earpiece amplifier, 42mW/channel stereo ground reference headphone amplifiers, volume control, and mixing circuitry into a single device. The filterless class D amplifier delivers 1.25W into an 8Ω load with <1% THD+N with a 5V supply. The E2S class D amplifier features a patented, ultra low EMI PWM architecture that significantly reduces RF emissions while preserving audio quality. The 42mW/channel headphone drivers feature TI’s ground referenced architecture that creates a ground-referenced output from a single supply, eliminating the need for bulky and expensive DC-blocking capacitors, saving space and minimizing cost.The LM49150 features a fully differential mono input, and two single-ended stereo inputs. The three inputs can be mixed/multiplexed to either the speaker or headphone amplifiers. Each input channel has an independent, 32-step digital volume control. The headphone output stage features an additional, 8-step gain control, while the speaker output stage has a selectable 6dB or 12dB gain. The mixer, volume control and device mode select are controlled through an I2C compatible serial interface. The LM49150’s superior click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM49150 is available in a ultra-small 20-bump DSBGA package (2.225mm X 2.644mm).

特性 Features

• E2S Class D Amplifier
• I2C Volume and Mode Control
• Flexible Output for Speaker and Headphone Output
• Soft Enable Function
• Thermal Shutdown Protection
• Micro-Power Shutdown
• Output power at VDD = 5V:
• Headphone: RL = 32Ω SE, THD+N ≤ 1%: 42mW (typ)
• Output power at VDD = 3.3V:
• Headphone: RL = 32Ω BTL, THD+N ≤ 1%: 42mW (typ)
• Output Offset
• HP Mode: 1mV (typ)
• Single Supply Operation (VDD): 2.7 to 5.5V
• I2C Single Supply Operation: 1.7 to 5.5V