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參數(shù)資料
| 型號： | AK4340 |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 英文描述： | 192kHz 24-Bit Stereo DAC with 2Vrms Output |
| 中文描述： | 192kHz的24位立體聲DAC 2Vrms的輸出 |
| 文件頁數(shù)： | 13/21頁 |
| 文件大?。?/td> | 265K |
| 代理商： | AK4340 |
ASAHI KASEI
AKM CONFIDENTIAL
[AK4340]
Rev.0.6
2005/11
- 13 -
LRCK
BICK
(64fs)
SDTI
0
3
1
2
24
31
0
1
31
0
1
23:MSB, 0:LSB
22
1
0
Don’t care
23
Lch Data
Rch Data
23
25
3
2
24
23
25
22
1
0
Don’t care
23
23
Figure 9. Mode 3 Timing
De-emphasis Filter
A digital de-emphasis filter is available for 32, 44.1 or 48kHz sampling rates (tc = 50/15μs) and is enabled or disabled
with DEM0 and DEM1. In case of double speed and quad speed mode, the digital de-emphasis filter is always OFF.
DEM1
DEM0
0
0
0
1
1
0
1
1
Mode
44.1kHz
OFF
48kHz
32kHz
Default
Table 7. De-emphasis Filter Control (Normal Speed Mode)
Output Volume
The AK4340 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 8.
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 8. ATT Transition Time
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