參數(shù)資料
型號(hào)： XWM8711EDS
廠商： Wolfson Microelectronics
英文描述： Internet Audio DAC with Integrated Headphone Driver
中文描述： 互聯(lián)網(wǎng)音頻DAC集成耳機(jī)驅(qū)動(dòng)器
文件頁數(shù)： 10/36頁
文件大?。?/td> 379K
代理商： XWM8711EDS
WM8711
Product Preview
WOLFSON MICROELECTRONICS LTD
PP Rev 1.2 November 2000
10
DEVICE DESCRIPTION
INTRODUCTION
The WM8711 is a low power audio DAC designed specifically for portable audio products. Its
features, performance and low power consumption make it ideal for portable MP3, CD and mini-disc
players.
The WM8711 includes line and headphone outputs from the on-board DAC, configurable digital audio
interface and a choice of 2 or 3 wire MPU control interface. It is fully compatible and an ideal partner
for a range of industry standard microprocessors, controllers and DSPs.
The on-board digital to analogue converter (DAC) accepts digital audio from the digital audio
interface. Digital filter de-emphasis at 32kHz, 44.1kHz and 48kHz can be applied to the digital data
under software control. The DAC employs a high quality multi-bit high-order oversampling
architecture to again deliver optimum performance with low power consumption.
The DAC outputs and Line Inputs (BYPASS) are available both at line level and through a
headphone amplifier capable of efficiently driving low impedance headphones. The headphone
output volume is adjustable in the analogue domain over a range of +6dB to
–
73dB and can be
muted.
The design of the WM8711 minimises power consumption without compromising performance. It
includes the ability to power off selective parts of the circuitry under software control, thus conserving
power. Separate power save modes can be configured under software control including a standby
and power off mode.
Special techniques allow the audio to be muted and the device safely placed into standby, sections
of the device powered off, volume levels adjusted without any audible clicks, pops or zipper noises.
Therefore standby and power off modes may be used dynamically under software control, whenever
playback is not required.
The device caters for a number of different sampling rates including industry standard 8kHz, 32kHz,
44.1kHz, 48kHz, 88.2kHz and 96kHz. The WM8711 has two schemes to support the programmable
sample rates: Normal industry standard 256/384 fs sampling mode may be used. A special USB
mode is included, where all audio sampling rates can be generated from a 12.00MHz USB clock. The
digital filters used for playback are optimised for each sampling rate used.
The digital audio interface can support a range of audio data formats including I2S, DSP Mode (a
burst mode in which frame sync plus 2 data packed words are transmitted), MSB-First, left justified
and MSB-First, right justified. The digital audio interface can operate in both master or slave modes.
The software control uses either a 2 or 3-wire MPU interface.
AUDIO SIGNAL PATH
DAC FILTERS
The DAC filters perform true 24 bit signal processing to convert the incoming digital audio data from
the digital audio interface at the specified sample rate to multi-bit oversampled data for processing by
the analogue DAC. Figure 6 illustrates the DAC digital filter path.
FROM DIGITAL
AUDIO
INTERFACE
MUTE
DIGITAL
INTERPOLATION
FILTER
TO LINE
OUTPUTS
DIGITAL
DE_EMPHASIS
DEEMP
DACMU
Figure 6 DAC Filter Schematic
相關(guān)PDF資料
PDF描述
XWM8721EDS Internet Audio DAC with Integrated Headphone Driver
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XWM8728EDS 24-bit, 192kHz Stereo DAC with Volume Control and DSD Support
XWM8729ED 24-bit, 192kHz Stereo DAC
XWM8731EDS Portable Internet Audion CODEC with Headphone Driver and Programmable Sample Rates
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XWM8721EDS 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Internet Audio DAC with Integrated Headphone Driver
XWM8721EDS/R 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Internet Audio DAC with Integrated Headphone Driver
XWM8722EDS 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:Stereo DAC with Integrated Tone Generator and Line/Variable Level Outputs
XWM8728EDS 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:24-bit, 192kHz Stereo DAC with Volume Control
XWM8728EDS/R 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:24-bit, 192kHz Stereo DAC with Volume Control
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