Maxim MAX98304的单声道3.2W D类音频放大的解决方案

时间:2011-07-30
  Maxim Integrated Products成立于1983年。
 
  2001年,Maxim并购了着名的Dallas Semiconductor。是的模拟信号和混合信号半导体公司。
 
  它们的使命是不断创造高品质的模拟工程解决方案,在世界范围内为基于微处理器的电子产品客户提供增值服务。它们通过努力达到它们的成本与业绩 Maxim Integrated Products成立于1983年,总部位于美国加利福尼亚的Sunnyvale,公司拥有7,5000多名员工,是世界范围内模拟和混合信号集成产品的设计、开发与生产领域的之一。通过对温度、压力、声音等现实世界的各种信号进行检测、放大,并将其转换成计算机处理所需要的数字信号, Maxim的电路把现实世界与数字世界“连接”在一起;更多MAXIM半导体产品请咨询杰鸿顺电子。
 
  Maxim 公司的MAX98304是单声道3.2W D类音频放大器,提供AB类音频性能和D类效率,提供五种引脚选择的增益(0dB,3dB,6dB,9dB和12dB),3.7V的静态电流0.95mA,超低噪音19μVRMS,PSRR为90dB,开关噪音抑制,热和过流保护,低电流关断模式。主要应用在笔记本和上网本电脑,手机,平板电脑,MP3播放器,手持音频播放器,VoIP电话。本文介绍了MAX98304主要特性,功能方框图,典型应用电路图,MAX98304评估板主要特性,电路图,材料清单和PCB元件布局图。
 
  The MAX98304 mono 3.2W Class D amplifier provides Class AB audio performance with Class D efficiency. This device offers five selectable gain settings (0dB, 3dB, 6dB, 9dB, and 12dB) set by a single gain-select input (GAIN)。
 
  Active emissions-limiting, edge-rate, and overshoot control circuitry greatly reduces EMI. A filterless spreadspectrum modulation scheme eliminates the need for output filtering found in traditional Class D devices. These features reduce application component count.
 
  The IC’s 0.95mA at 3.7V (1.2mA at 5V) quiescent current extends battery life in portable applications.
 
  The IC is available in a 9-bump (1.0mm x 1.0mm) WLP with 0.3mm pitch that is specified over the extended -40NC to +85NC temperature range.
 
  MAX98304主要特性:
 
  Low Quiescent Current: 0.95mA at 3.7V
 
  Spread Spectrum and Active Emissions Limiting
 
  Five Pin-Selectable Gains
 
  19μVRMS Ultra-Low Noise
 
  90dB PSRR
 
  Click-and-Pop Suppression
 
  Thermal and Overcurrent Protection
 
  Low-Current Shutdown Mode
 
  1.0mm x 1.0mm, 9-Bump WLP (0.3mm Pitch) Space-Saving Package
 
  MAX98304应用:
 
  Notebook and Netbook Computers
 
  Cellular Phones
 
  Tablets
 
  MP3 Players
 
  Portable Audio Players
 
  VoIP Phones
 
  图1。MAX98304功能方框图
 
  图2。MAX98304典型应用电路图
 
  MAX98304评估板
 
  The MAX98304 evaluation kit (EV kit) is a fully assembled and tested circuit board that uses the MAX98304 filterless Class D amplifier to drive a speaker in portable audio applications. The EV kit comes with a MAX98304EWL+ in a 9-bump, 0.3mm pitch wafer-level package (WLP)。 Designed to operate from a 2.5V to 5.5V DC power supply, the EV kit is capable of delivering 3.2W into a 4Ω load. The EV kit accepts differential or single-ended input signals.
 
  MAX98304评估板主要特性:
 
  Filterless Operation Passes Radiated Emissions with 60cm of Speaker Cable
 
  2.5V to 5.5V Single-Supply Operation
 
  3.2W Mono Class D Output
 
  Selectable Gain Control
 
  Differential or Single-Ended Input
 
  Low-Power Shutdown Input
 
  Fully Assembled and Tested
 
  图3。MAX98304评估板电路图
 
  MAX98304评估板材料清单(BOM):
 
 
  图4。MAX98304评估板元件布局图
 
  详情请见:
 
  https://datasheets.maxim-ic.com/en/ds/MAX98304.pdf
 
  和
 
  https://datasheets.maxim-ic.com/en/ds/MAX98304EVKIT.pdf

  
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