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WM2002立體聲耳機驅動解決方案
文章來源: 更新時間:2010/9/9 12:05:00
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  Wolfson 公司的WM2002是采用Wolfson myZoneTM環境噪音消(ANC)除技術的立體聲耳機驅動器,可采用單端或BTL輸出配置,支持模擬播放或語音輸入,模擬或數字麥克風。WM2002集成了功率管理,包括DC/DC轉換器,電荷泵和LDO穩壓器,采用單節AAA電池供電。環境噪音可降低25dB(典型值),降噪帶寬(40Hz -4kHz) ,BTL驅動的THD+N可達-80dB。主要用在帶ANC的手機,耳機以及藍牙單聲道/立體聲手機。本文介紹了WM2002主要特性,方框圖,典型應用框圖以及推薦外接元件數值和DC1升壓轉換器和電荷泵外接元件數值。

Stereo Headphone Driver with Wolfson myZoneTM Ambient Noise Cancellation

The WM2002 is a low power, high quality stereo headphone driver, delivering Wolfson’s patented myZoneTM ambient noise cancellation in a single-ended or BTL (bridge-tied-load) output configuration. The WM2002 supports analogue playback or voice input, and analogue or digital microphone inputs for noisemonitoring microphones.

Designed for embedded applications or incorporated within a stand-alone headset or headphone, the Wolfson myZone™ ANC noise cancellation engine performs ambient noise cancellation during a voice call or during music playback.

The ambient noise input is supported via single-ended or differential analogue microphone interfaces; digital microphone input is also supported. Up to 10 noise input microphones can be supported at once.

The WM2002 provides integrated power management, comprising a DC-DC converter, Charge Pump and LDO Regulators. Many different power supply configurations are thus supported. The entire device can be powered from a single cell AAA battery, or from 2xAAA cells, or from an external regulated supply.

System clocking is achieved using an on-chip oscillator. An external clock can be connected directly, if available. The WM2002 is configured using programmable settings stored in an integrated non-volatile memory. The configuration stored in the OTP memory is enabled automatically at start-up. If required, the WM2002 can also be configured using register control accessed using a 2-wire serial control interface.

WM2002主要特性:

Wolfson myZone™ Ambient Noise Cancellation (ANC)

- >30dB (peak), 25dB (typical) ambient noise reduction*

- Wide noise cancellation bandwidth (40Hz to 4kHz)*

- * depending on acoustic configuration

- Multiple banks of ANC coefficients can be programmed to support different operating conditions

Audio inputs

- Up to 10 analogue or digital microphones

- Single-ended or differential analogue microphone input

- 2 single-ended or 1 differential line input per channel

Headphone driver (LDO4VOUT = 1.8V)

- 45mW per channel into 16ohm load

- 22mW per channel into 32ohm load

- Single-ended or differential (BTL) drive configuration

- -80dB THD+N for differential (BTL) drive

Integration

- On-chip DC-DC boost converter, charge-pump and LDOs

- Flexible power supply options, including single cell battery (1 x AAA battery) or (2 x AAA/AAAA)

- Internal crystal oscillator

Miscellaneous

- Monitor pin to select mute / talk-through modes

- LED driver

- Tone generator for audible status indication

- Pop and click noise protection circuit

- RFI suppression

- 48-pin QFN package (7 x 7 x 0.75mm, 0.5mm pitch)

WM2002應用:

“Pod-style” stereo ear-buds, headsets, headphones with ANC

“Supra-Aural” stereo headphones with ANC

Mono/Stereo Bluetooth headsets with ANC


圖1 WM2002方框圖

圖2 WM2002典型應用框圖

圖3 WM2002推薦外接元件數值

圖4 WM2002 DC1升壓轉換器和電荷泵外接元件數值

 
 
 
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