NS LM49155 PowerWise降噪音频功率放大方案

NS 公司的LM49155 是高度集成的PowerWise音频子系统，集成了噪音抑制麦克风放大器，1.35W单声道带ALC的D类放大器，带AGC的AB类耳机驱动器，带开关机声抑制的高效立体声参考地耳机放大器以及I2C模式选择和音量控制。主要用于手机和手提电子设备。本文介绍了LM49155主要指标，简化方框图以及典型应用电路。

Uplink Noise Suppression & Downlink SNR Enhancement Analog Audio Subsystem

The LM49155 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones. The LM49155 combines a Noise Suppression microphone amplifier, a 1.35W mono class D amplifier with ALC, class AB earpiece driver with AGC, a high efficiency, stereo, ground referenced headphone amplifier with click pop suppression and I2C modes select and volume control.

The LM49155 features analog fully differential input, and differential output microphone amplifier designed to reduce background acoustic noise, while delivering superb speech clarity in voice communication applications. Downlink SNR enhancement with an advanced acoustic AGC technology to adjust output levels.
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