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NS LM49153 G类耳机放大器解决方案

关键词:消费类电子 D类放大器 G类放大器

时间:2011-04-06 11:25:45       作者:NS       来源:LM49153

NS 公司的LM49153是全集成音频子系统,包括高效25mW的G类耳机放大器(THD+N ≤ 1%)和高效的1.35W D类扬声器放大器(RL = 8Ω, THD+N < 1%),通过I2C进行音量,模式选择和关断控制,主要用在手机和智能手机。本文介绍了LM49153主要指标,主要特性,典型音频放大器应用电路以及演示板电路图和材料清单,元件布局图。

The LM49153 is a fully integrated audio subsystem designed for portable handheld applications such as cellular phones.

Part of National’s PowerWise family of products, the LM49153 combines an earpiece switch, a high efficiency 25mW class G headphone amplifier, and a high efficiency 1.35W class D loudspeaker into a single device.

The headphone amplifiers feature National’s class G ground referenced architecture that creates a ground-referenced output with dynamic supply rails for optimum efficiency. The
class D amplifier features an ALC (Automatic Level Control) with a noise gate that provides both no-clip and speaker protection.

Mode selection, shutdown control, and volume are controlled through an I2C compatible interface. Click and pop suppression eliminates audible transients on power-up/down and during shutdown. The LM49153 is available in an ultra-small 25-bump 0.4mm pitch micro SMD package (2.30mm x 2.42mm).

LM49153主要指标:

■ Class G Headphone Amplifier,..

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