歐勝微電子日前宣布推出WM8958音頻中心(AudioHub)解決方案，該方案專為給便攜式多媒體應(yīng)用提供高清晰度音頻(HDAudio)而設(shè)計，這些應(yīng)用包括智能手機、平板電腦、電子書和各種導(dǎo)航設(shè)備等等。
當與歐勝業(yè)界領(lǐng)先的AudioPlus™產(chǎn)品結(jié)合在一起時，比如與其數(shù)字硅微機電系統(tǒng)(MEMS)麥克風(fēng)、電源管理芯片和噪音消除等解決方案結(jié)合時，這款從架構(gòu)上就全新定義的WM8958為高清晰度質(zhì)量音頻設(shè)立了基準。
這款多通道超低功耗音頻中心解決方案在數(shù)字模擬轉(zhuǎn)換器(DAC)回放期間可以提供100dB信噪比(SNR)，同時其內(nèi)置的立體聲D/AB類揚聲器驅(qū)動器以及W類耳機驅(qū)動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多頻段壓縮器(MBC)的音頻增強數(shù)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，而不會造成超負荷或損壞。通過與一個板上的參量化均衡器和動態(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(yīng)用和手機鈴聲帶來超凡的音頻回放。
它的立體聲采樣率轉(zhuǎn)換和多通道數(shù)字混音功能，與強大的模擬混音能力相結(jié)合，允許WM8958支持一整套不同的構(gòu)架和使用模式。
它的一個智能數(shù)字麥克風(fēng)接口可以為多達四個的數(shù)字麥克風(fēng)提供電源整流、一個低抖動時鐘和抽樣濾波器，同時主動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)品線經(jīng)理DuncanMacadie說到：“WM8958音頻中心不僅提供了出色的信噪比(SNR)和超低功耗，而且通過其多頻段壓縮器顯著提升了便攜式應(yīng)用的多媒體聆聽體驗。當和歐勝一系列業(yè)界領(lǐng)先的AudioPlus™產(chǎn)品結(jié)合后，WM8958將會把高清晰度音頻帶給下一代多媒體設(shè)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
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Hi-Fi 24-bit 4-channel DAC and 2-channel ADC
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100dB SNR during DAC playback (‘A’ weighted)
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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
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1W stereo / 2W mono class D/AB speaker driver
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Capless Class W headphone drivers
- Integrated charge pump
- 5.3mW total power for DAC playback to headphones
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4 Line outputs (single-ended or differential)
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BTL Earpiece driver
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Digital audio interfaces for multi-processor architecture
- Asynchronous stereo duplex sample rate conversion
- Powerful mixing and digital loopback functions
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ReTune™ Mobile 5-band, 6-channel parametric EQ
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Multiband compressor and dynamic range controller
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Dual FLL provides all necessary clocks
- Self-clocking modes allow processor to sleep
- All standard sample rates from 8kHz to 96kHz
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Active noise reduction circuits
- DC offset correction removes pops and clicks
- Ground loop noise cancellation
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Integrated LDO regulators
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72-ball W-CSP package (4.516 x 4.258 x 0.7mm)
應(yīng)用原理圖
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