LM49250中文资料具有接地参考耳机放大器的增强型排放抑制立体声 D 类音频子系统数据手册TI规格书

描述 Description

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.

特性 Features

• Output Short Circuit Protection
• Stereo Filterless Class D Operation
• Ground Referenced Headphone Drivers
• 32-Step Input Volume Control
• Minimum External Components
• Micro-Power Shutdown
• Single Supply Operation
• RL = 4Ω, THD+N ≤ 10%: 2.4W/Ch
• Headphone:
• RL = 32Ω, THD+N ≤ 1%: 45mW/Ch
• Earpiece:
• RL = 32Ω, THD+N ≤ 1%: 90mW
• Shutdown Current: 0.1μA
• Efficiency at 3.6V, 500mW into 8Ω: 85%

简介

LM49250属于开发板套件编程器的评估板-音频放大器。由TI制造生产的LM49250评估板 - 音频放大器音频放大器评估板是带有元器件的电路，用于提供特定集成电路或器件的工作实例。该产品族中的电路板提供了模拟放大器实例。放大器类型包括 AB 类、D 类、G 类、H 类和 K 类，输出为耳机、1 声道（单声道）、2 声道（立体声）、3 声道、4 声道、6 声道和 8 声道。