參數(shù)資料
型號(hào): AK4387
廠商: Asahi Kasei Microsystems Co.,Ltd
英文描述: 106dB 192kHz 24-Bit 2ch ツヒ DAC
中文描述: 一零六分貝192kHz的24位2通道ツヒ數(shù)模轉(zhuǎn)換器
文件頁(yè)數(shù): 11/21頁(yè)
文件大?。?/td> 257K
代理商: AK4387
ASAHI KASEI
[AK4387]
MS0429-E-00
2005/09
- 11 -
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 4. 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
Table 8. De-emphasis Filter Control (Normal Speed Mode)
Output Volume
The AK4387 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 10.
Sampling Speed
1 Level
Normal Speed Mode
4LRCK
Double Speed Mode
8LRCK
Quad Speed Mode
16LRCK
Table 9. ATT Transition Time
Mode
44.1kHz
OFF
48kHz
32kHz
Default
Transition Time
255 to 0
1020LRCK
2040LRCK
4080LRCK
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