參數(shù)資料
型號(hào)： WM8756EFT
廠商： Wolfson Microelectronics
英文描述： 192KHZ SIX CHANNEL SACD COMPATIBLE AUDIO DAC
中文描述： 192kHz的六聲道SACD的兼容的音頻數(shù)模轉(zhuǎn)換器
文件頁(yè)數(shù)： 13/39頁(yè)
文件大?。?/td> 330K
代理商： WM8756EFT
WM8756
Advance Information
AI Rev 1.3 October 2001
13
SYSTEM CLOCK FREQUENCY (MHZ)
SAMPLING
RATE
(LRCIN)
32kHz
44.1kHz
48kHz
96kHz
192kHz
128fs
192fs
256fs
384fs
512fs
768fs
4.096
5.6448
6.114
12.288
24.576
6.144
8.467
9.216
18.432
36.864
8.192
11.2896
12.288
24.576
Unavailable
12.288
16.9340
18.432
36.864
Unavailable
16.384
22.5792
24.576
Unavailable
Unavailable
24.576
33.8688
36.864
Unavailable
Unavailable
Table 11 System Clock Frequencies Versus Sampling Rate
DSD MODE
When pin 14, DSDB pin is held low, the device is reconfigured to operate as a DSD or ‘bitsteam’
compatible DAC. That is, the input audio data is in a sigma delta modulated form, or pulse density
modulated. In this case the only signals required are the bitstream for each channel supported, and the
oversampling clock.
WM8756 supports this mode when run at a 64x oversample rate. That is, the bitstream data is supplied at
a rate of 64 bits per normal word clock. Of course no word clock is provided, and the actual spectral
content of the data is determined by the noise shaping that was used to create the bitstream. WM8756
can support six channels of bitstream or DSD audio. Data BITSTREAMS and the 64fs clock are applied
to pins 3-9 and 10, if the DSDCLK128 pin is used. Signals applied to the PCM input pins 1,2, 45-48 are
ignored. The DSDB signal controls an internal multiplexor which switches the signals on the DSD input
pins into the DAC rather than the PCM signals.
In DSD mode operation, the entire digital filter on WM8756 is disabled, and the bitstream data is applied
directly to the multi-bit switched capacitor DAC’s in the analogue part of the device. There, rather than
operate as oversampled multi bit DACs, the DAC inputs are reconfigured to act as analogue FIR filters, so
providing both D to A conversion of the bitstream data, and analogue smoothing of the sampled waveform
with no phase distortion. Filter responses of the analogue filter that results are shown in Figure 26 - Figure
29. Note in DSD mode software controlled functions such as digital volume control and phase reversal,
are not available. The FIR filter response is designed such that by adding only a 3
order Butterworth type
post DAC filter, which may be implemented with a single op-amp, the Scarlet book specified filter
requirements may be met, saving cost over the 5
order filter normally needed.
It is normally desirable to use an external analogue post-DAC filter, particularly in the case of DSD
operation due to the presence of high frequency energy as a result of the aggressive high order noise
shaping used in the creation of the modulated DSD datastream. The analogue FIR filter used in WM8756
provides useful filtering of this noise, but it may be desirable to add further post filtering using active RC
filters. Figure 26 - Figure 29 show the overall filter response of the combined DAC filter operating in DSD
mode with an external 3
order Butterworth active RC post-DAC filter.
PCM DIGITAL AUDIO INTERFACE
PCM audio data is applied to the internal DAC filters via the PCM Digital Audio Interface. 5 popular
interface formats are supported:
Left Justified mode
Right Justified mode
I
2
S mode
DSP Early mode
DSP Late mode
All 5 formats send the MSB first and support word lengths of 16, 20, 24 and 32 bits except that 32 bit data
is not supported in right justified mode. DIN0/1/2 and LRCIN are 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 DIN0/1/2
inputs. Audio Data for each stereo channel 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.
In left justified, right justified and I
2
S modes, 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
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