參數(shù)資料
型號: EK4355
廠商: Asahi Kasei Microsystems Co.,Ltd
英文描述: 192KHZ 24BIT 6CH DAC FOR DVD AUDIO
中文描述: 192kHz的24位6路援會的DVD音頻
文件頁數(shù): 13/24頁
文件大?。?/td> 160K
代理商: EK4355
ASAHI KASEI
[AK4355]
MS0063-E-01
2002/07
- 13 -
n
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
Mode
0
0
1
1
0
1
0
1
44.1kHz
OFF
48kHz
32kHz
Default
Table 8. De-emphasis Filter Control (Normal Speed Mode)
n
Output Volume
The AK4355 includes channel independent digital output volumes (ATT) with 256 levels including MUTE and 0.5dB step.
These volumes are in front of the DAC and can attenuate the input data from 0dB to –127dB and mute. Transition time is set
by AST1-0 bits(Table10).In Mode0 and Mode1, when changing levels, transitions are executed via soft changes; thus no
switching noise occurs during these transitions.
ATT7-0
Attenuation Level
FFH
0dB
FEH
-0.5dB
FDH
-1.0dB
:
02H
-126.5dB
01H
-127.0dB
00H
MUTE (-
)
Table 9. Attenuation Level of Output Volume
Mode
ATS1
ATS0
0
0
0
1
0
1
2
1
0
3
1
1
Table 10. Transition time of output volume
In case of Mode0, it takes 7424/fs(168ms@fs=44.1k) to transit from FFH(0dB) to 00H(MUTE). In case of Mode1, it takes
1061/fs(24ms@fs=44.1k) to transit from FFH(0dB) to 00H(MUTE). In case Mode2 and 3,it takes 256/fs(6ms@fs=44.1k) to
transit from FFH(0dB) to 00H (MUTE). If PDN pin goes to “L”, ATT7-0 registers are initialized to FFH.ATTN7-0 registers go
to FFH when RSTN bit is set to “0”. When RSTN bit returns to “1”, ATT7-0 registers go to the set value. Digital output
volume function is independent of soft mute function.
:
Default
ATT speed
7424/fs
1061/fs
256/fs
Reserved
Default
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