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WM8716SEDS 参数 Datasheet PDF下载

WM8716SEDS图片预览
型号: WM8716SEDS
PDF下载: 下载PDF文件 查看货源
内容描述: 高性能24位, 192kHz的立体声DAC [High Performance 24-bit, 192kHz Stereo DAC]
分类和应用: 转换器光电二极管
文件页数/大小: 27 页 / 301 K
品牌: WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
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Production Data  
WM8716  
DEVICE DESCRIPTION  
The WM8716 is a high performance 128fs oversampling rate stereo DAC employing a novel 64 level  
sigma delta DAC design which provides optimised signal-to-noise performance and clock jitter  
tolerance. It is ideally suited to high quality audio applications such as CD, DVD-audio, home theatre  
receivers and professional mixing consoles. The WM8716 supports sample rates from 8ks/s to  
192ks/s.  
The control functions of the WM8716 are either pin selected (hardware mode) or programmed via the  
serial interface (software mode). Control functions that are available include: data input word length  
and format selection (16-24 bits: I2S, left justified or right justified): de-emphasis sample rate  
selection (48kHz, 44.1kHz and 32kHz); differential output modes; a software or hardware mute and  
independently digitally controllable attenuation on both channels.  
The digital filtering may be bypassed entirely by selecting MODE8X. Data is then input directly to the  
DAC, bypassing the digital filters. Left and right channels are input separately, using the MODE pin  
as the right channel input. This mode allows the use of alternative digital filters, such as the Pacific  
Microsonics PMD100 HDCD filter.  
In addition to the normal stereo operating mode the WM8716 may also be used in dual differential  
mode with either the left or right channel (selectable) being output differentially. Two WM8716s can  
then be used in parallel to implement a stereo channel, each supporting a single channel  
differentially. This mode is available in both software and hardware modes and may also be used in  
conjunction with MODE8X.  
SYSTEM CLOCK  
Sample rates from 8ks/s up to 96ks/s are available, and automatically selected, with a system clock  
of 256fs, 384fs, 512fs or 768fs. In addition a system clock of 128fs or 192fs may be used, with  
sample rates up to 192ks/s. With a 128fs or 192fs system clock 64x oversampling mode operation is  
automatically selected and the first stage of the digital filter is bypassed.  
WM8716 has an asynchronous monitor circuit, which in the event of removal of the master system  
clock, resets the digital filters and analogue circuits, muting the output. Re-application of the system  
clock re-starts the filters from an intitialised state. Control registers are not reset under this condition.  
The WM8716 is tolerant of asynchronous bit clock jitter. The internal signal processing  
resynchronises to the external LRCIN once the phase difference between bit clock and the system  
clock exceeds half an LRCIN period. During this re-synch period the interpolating filters will either  
miss or repeat an audio sample, minimising the audible effects of the operation. Table 1 shows the  
typical system clock frequency inputs for the WM8716.  
SAMPLING  
RATE  
SYSTEM CLOCK FREQUENCY (MHZ)  
128fs  
192fs  
256fs  
384fs  
512fs  
768fs  
(LRCIN)  
32kHz  
4.096  
5.6448  
6.114  
6.144  
8.467  
8.192  
11.2896  
12.288  
24.576  
12.288  
16.9340  
18.432  
36.864  
16.384  
22.5792  
24.576  
24.576  
33.8688  
36.864  
44.1kHz  
48kHz  
9.216  
96kHz  
12.288  
24.576  
18.432  
36.864  
Unavailable Unavailable  
192kHz  
Unavailable Unavailable Unavailable Unavailable  
Table 1 System Clock Frequencies Versus Sampling Rate  
w
PD Rev 4.1September 2006  
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