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參數(shù)資料
| 型號： | WM8718 |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | 24 BIT DIFFERENTIAL STEREO DAC WITH VOLUME CONTROL |
| 中文描述： | 24位差分立體聲DAC，具有音量控制 |
| 文件頁數(shù)： | 10/27頁 |
| 文件大小： | 284K |
| 代理商： | WM8718 |
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WM8718
Production Data
w
PD Rev 4.1 March 2004
10
DEVICE DESCRIPTION
INTRODUCTION
The WM8718 is a high performance DAC designed for digital consumer audio applications. Its
range of features makes it ideally suited for use in DVD players, AV receivers and other high-end
consumer audio equipment.
WM8718 is a complete 2-channel differential stereo audio digital-to-analogue converter, including
digital interpolation filter, multi-bit sigma delta with dither, switched capacitor multi-bit stereo DAC.
The WM8718 includes an on-chip digital volume control, configurable digital audio interface and a
3 wire MPU control interface. The WM8718 has left and right zero flag output pins, allowing the
user to control external muting circuits. It is fully compatible and an ideal partner for a range of
industry standard microprocessors, controllers and DSPs.
The software control interface may be asynchronous to the audio data interface. The control data
will be re-synchronised to the audio processing internally.
Operation using a master clock of 256fs, 384fs, 512fs or 768fs is provided, selection between
clock rates being automatically controlled. Sample rates (fs) from less than 8kHz to 192kHz are
allowed, provided the appropriate master clock is input. The audio data interface supports right
justified, left justified and I
S (Philips left justified, one bit delayed) interface formats along with a
highly flexible DSP serial port interface.
The device is packaged in a small 20-pin SSOP.
CLOCKING SCHEMES
In a typical digital audio system there is one central clock source producing a reference clock to
which all audio data processing is synchronised. This clock is often referred to as the audio
system’s Master Clock. The external master system clock can be applied directly through the
MCLK input pin with no software configuration necessary for sample rate selection.
Note that on the WM8718, MCLK is used to derive clocks for the DAC path. The DAC path
consists of DAC sampling clock, DAC digital filter clock and DAC digital audio interface timing. In
a system where there are a number of possible sources for the reference clock, it is
recommended that the clock source with the lowest jitter be used to optimise the performance of
the DAC.
DIGITAL AUDIO INTERFACE
Audio data is applied to the internal DAC filters via the Digital Audio Interface. Five popular
interface formats are supported:
Left Justified mode
Right Justified mode
I
2
S mode
DSP Early mode
DSP Late mode
All five formats send the MSB first and support word lengths of 16, 20, 24 and 32 bits with the
exception that 32 bit data is not supported in right justified mode. DIN and LRCIN maybe
configured to be sampled on the rising or falling edge of BCKIN.
In left justified, right justified and I
2
S modes, the digital audio interface receives data on the DIN
input. Audio Data is time multiplexed with LRCIN indicating whether the left or right channel is
present. LRCIN is also used as a timing reference to indicate the beginning or end of the data
words. The minimum number of BCKINs per LRCIN period is 2 times the selected word length.
LRCIN must be high for a minimum of word length BCKINs and low for a minimum of word length
BCKINs. Any mark to space ratio on LRCIN is acceptable provided the above requirements are
met
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| WM8718_06 | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:24 Bit Differential Stereo DAC with Volume Control |
| WM8718-6088-DS20-M-S | 功能描述:音頻 IC 開發(fā)工具 WM8718 MINI Eval Board System RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| WM8718EDS | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:24 BIT DIFFERENTIAL STEREO DAC WITH VOLUME CONTROL |
| WM8718EDS/R | 制造商:WOLFSON 制造商全稱:WOLFSON 功能描述:24 BIT DIFFERENTIAL STEREO DAC WITH VOLUME CONTROL |
| WM8718GEFL/RV | 功能描述:音頻數(shù)/模轉(zhuǎn)換器 IC Stereo DAC Differential O/P RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量: 分辨率:16 bit 接口類型:I2S, UBS 轉(zhuǎn)換速率: 信噪比:98 dB 工作電源電壓:5 V DAC 輸出端數(shù)量:2 工作溫度范圍:- 25 C to + 85 C 電源電流:23 mA 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-32 封裝:Reel |
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