欧胜微电子日前宣布推出WM8958音频中心(AudioHub)解决方案，该方案专为给便携式多媒体应用提供高清晰度音频(HDAudio)而设计，这些应用包括智能手机、平板电脑、电子书和各种导航设备等等。

    当与欧胜业界领先的AudioPlus™产品结合在一起时，比如与其数字硅微机电系统(MEMS)麦克风、电源管理芯片和噪音消除等解决方案结合时，这款从架构上就全新定义的WM8958为高清晰度质量音频设立了基准。

    这款多通道超低功耗音频中心解决方案在数字模拟转换器(DAC)回放期间可以提供100dB信噪比(SNR)，同时其内置的立体声D/AB类扬声器驱动器以及W类耳机驱动器能够在音频回放期间将功耗降到最低。

    WM8958带有一款可以运行一个多频段压缩器(MBC)的音频增强数字信号处理器(DSP)。这能够确保从小型扬声器产生明显更响亮、更通透的音效，而不会造成超负荷或损坏。通过与一个板上的参量化均衡器和动态范围控制器配合，MBC能够提供扩展和优化扬声器输出的能力，从而为各种多媒体应用和手机铃声带来超凡的音频回放。

    它的立体声采样率转换和多通道数字混音功能，与强大的模拟混音能力相结合，允许WM8958支持一整套不同的构架和使用模式。

    它的一个智能数字麦克风接口可以为多达四个的数字麦克风提供电源整流、一个低抖动时钟和抽样滤波器，同时主动接地回路噪音消除和直流偏压纠正可以帮助免除爆破音和抑制耳机输出上的接地噪音。

    欧胜音频中心产品线经理DuncanMacadie说到：“WM8958音频中心不仅提供了出色的信噪比(SNR)和超低功耗，而且通过其多频段压缩器显著提升了便携式应用的多媒体聆听体验。当和欧胜一系列业界领先的AudioPlus™产品结合后，WM8958将会把高清晰度音频带给下一代多媒体设备。”

描述

The WM8958 is a highly integrated ultra-low power hi-fi CODEC designed for smartphones and other portable devices rich in multimedia features.

An integrated stereo class D/AB speaker driver and class W headphone driver minimize power consumption during audio playback.

The device requires only two voltage supplies, with all other internal supply rails generated from integrated LDOs.

Stereo full duplex asynchronous sample rate conversion and multi-channel digital mixing combined with powerful analogue mixing allow the device to support a huge range of different architectures and use cases.

A multiband compressor and programmable parametric EQ provide volume maximisation and speaker compensation in the digital playback paths. The dynamic range controller can be used in record or playback paths for maintaining a constant signal level, maximizing loudness and protecting speakers against overloading and clipping.

A smart digital microphone interface provides power regulation, a low jitter clock output and decimation filters for up to four digital microphones. A MIC activity detect with interrupt is available.

Active ground loop noise rejection and DC offset correction help prevent pop noise and suppress ground noise on the headphone outputs.

特色

• Hi-Fi 24-bit 4-channel DAC and 2-channel ADC
• 100dB SNR during DAC playback (‘A’ weighted)
• Smart MIC interface
  -  Power, clocking and data input for up to four digital MICs
  -  High performance analogue MIC interface
  -  MIC activity monitor & interrupt allows processor to sleep
• 1W stereo / 2W mono class D/AB speaker driver
• Capless Class W headphone drivers
  -  Integrated charge pump
  -  5.3mW total power for DAC playback to headphones
• 4 Line outputs (single-ended or differential)
• BTL Earpiece driver
• Digital audio interfaces for multi-processor architecture
  -  Asynchronous stereo duplex sample rate conversion
  -  Powerful mixing and digital loopback functions
• ReTune™ Mobile 5-band, 6-channel parametric EQ
• Multiband compressor and dynamic range controller
• Dual FLL provides all necessary clocks
  -  Self-clocking modes allow processor to sleep
  -  All standard sample rates from 8kHz to 96kHz
• Active noise reduction circuits
  -  DC offset correction removes pops and clicks
  -  Ground loop noise cancellation
• Integrated LDO regulators

• 72-ball W-CSP package (4.516 x 4.258 x 0.7mm)

  应用原理图