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參數(shù)資料
| 型號： | AK4397 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | High Performance Premium 32-Bit DAC |
| 中文描述： | 優(yōu)質(zhì)高性能32位DAC |
| 文件頁數(shù)： | 23/37頁 |
| 文件大小： | 513K |
| 代理商： | AK4397 |
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[AK4397]
MS0616-E-00
2007/05
- 23 -
■
D/A conversion mode switching timing
RSTN bit
D/A Data
D/A Mode
≥
4/fs
≥
0
PCM Data
DSD Data
PCM Mode
DSD Mode
Figure 9. D/A Mode Switching Timing (PCM to DSD)
RSTN bit
D/A Data
D/A Mode
≥
4/fs
DSD Data
PCM Data
DSD Mode
PCM Mode
Figure 10. D/A Mode Switching Timing (DSD to PCM)
Caution: In DSD mode, the signal level is ranging from 25% to 75%. Peak levels of DSD signal above this duty are not
recommended by SACD format book (Scarlet Book).
■
De-emphasis Filter
A digital de-emphasis filter is available for 32kHz, 44.1kHz or 48kHz sampling rates (tc = 50/15μs) and is enabled or
disabled with DEM1-0 pins or DEM1-0 bits. In case of double speed and quad speed mode, the digital de-emphasis filter
is always off. When DSD mode, DEM1-0 bits are ignored. The setting value is held even if PCM mode and DSD mode
are switched.
DEM1
DEM0
0
0
0
1
1
0
1
1
Table 12. De-emphasis Control (Normal Speed Mode)
■
Output Volume
The AK4397 includes channel independent digital output volumes (ATT) with 256 levels at linear step including MUTE.
These volumes are in front of the DAC and can attenuate the input data from 0dB to –48dB and mute. When changing
levels, transitions are executed via soft changes; thus no switching noise occurs during these transitions. The transition
time of 1 level and all 256 levels is shown in Table 13.
Mode
44.1kHz
OFF
48kHz
32kHz
(default)
Transition Time
1 Level
4LRCK
8LRCK
16LRCK
Sampling Speed
255 to 0
1020LRCK
2040LRCK
4080LRCK
Normal Speed Mode
Double Speed Mode
Quad Speed Mode
Table 13. ATT Transition Time
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