LM49153 G类耳机放大器解决方案

2012-02-11 12:22:02来源: 互联网
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,

  HPVDD = 1.8V, RL = 32Ω

  IDDQHP 1.2mA (typ)

  POUT, THD+N ≤ 1% 25mW (typ)

  HP VOS 0.5mV (typ)

  ■ Mono Class D Speaker Amplifier

  RL = 8Ω, THD+N < 1%

  POUT, LSVDD = 5.0V 1.35W (typ)

  POUT, LSVDD = 3.6V 680mW (typ)

  Efficiency 88% (typ)

  LM49153主要特性:

  ■ Class G Ground Referenced Headphone Outputs

  ■ High Efficiency Class D Amplifier with Spread Spectrum

  ■ No Clip

  ■ Speaker Protection

  ■ Noise Gate

  ■ I2C Volume and Mode Control

  ■ Advanced Click-and-Pop Suppression

  ■ Micro-power shutdown

  LM49153应用:

  ■ Feature phones

  ■ Smart phones

  

 

  图1。LM49153典型音频放大器应用电路

  

 

  图2。LM49153演示板电路图

  

  

 

  

 

  图3 LM49153演示板元件布局图(顶层)

关键字:LM49153  耳机  放大器

编辑:神话 引用地址:http://www.eeworld.com.cn/mndz/2012/0211/article_14136.html
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