歐勝微電子日前宣布推出WM8958音頻中心(AudioHub)解決方案，該方案專(zhuān)為給便攜式多媒體應用提供高清晰度音頻(HDAudio)而設計，這些應用包括智能手機、平板電腦、電子書(shū)和各種導航設備等等。

    當與歐勝業(yè)界領(lǐng)先的AudioPlus™產(chǎn)品結合在一起時(shí)，比如與其數字硅微機電系統(MEMS)麥克風(fēng)、電源管理芯片和噪音消除等解決方案結合時(shí)，這款從架構上就全新定義的WM8958為高清晰度質(zhì)量音頻設立了基準。

    這款多通道超低功耗音頻中心解決方案在數字模擬轉換器(DAC)回放期間可以提供100dB信噪比(SNR)，同時(shí)其內置的立體聲D/AB類(lèi)揚聲器驅動(dòng)器以及W類(lèi)耳機驅動(dòng)器能夠在音頻回放期間將功耗降到最低。

    WM8958帶有一款可以運行一個(gè)多頻段壓縮器(MBC)的音頻增強數字信號處理器(DSP)。這能夠確保從小型揚聲器產(chǎn)生明顯更響亮、更通透的音效，而不會(huì )造成超負荷或損壞。通過(guò)與一個(gè)板上的參量化均衡器和動(dòng)態(tài)范圍控制器配合，MBC能夠提供擴展和優(yōu)化揚聲器輸出的能力，從而為各種多媒體應用和手機鈴聲帶來(lái)超凡的音頻回放。

    它的立體聲采樣率轉換和多通道數字混音功能，與強大的模擬混音能力相結合，允許WM8958支持一整套不同的構架和使用模式。

    它的一個(gè)智能數字麥克風(fēng)接口可以為多達四個(gè)的數字麥克風(fēng)提供電源整流、一個(gè)低抖動(dòng)時(shí)鐘和抽樣濾波器，同時(shí)主動(dòng)接地回路噪音消除和直流偏壓糾正可以幫助免除爆破音和抑制耳機輸出上的接地噪音。

    歐勝音頻中心產(chǎn)品線(xiàn)經(jīng)理DuncanMacadie說(shuō)到：“WM8958音頻中心不僅提供了出色的信噪比(SNR)和超低功耗，而且通過(guò)其多頻段壓縮器顯著(zhù)提升了便攜式應用的多媒體聆聽(tīng)體驗。當和歐勝一系列業(yè)界領(lǐng)先的AudioPlus™產(chǎn)品結合后，WM8958將會(huì )把高清晰度音頻帶給下一代多媒體設備。”

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)

  應用原理圖