參數(shù)資料
型號(hào)： AK4359
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： 192 KHZ 24 BIT 8CH DAC
中文描述： 192千赫24位8路數(shù)模轉(zhuǎn)換器
文件頁(yè)數(shù)： 18/32頁(yè)
文件大?。?/td> 369K
代理商： AK4359
ASAHI KASEI
[AK4359]
MS0289-E-00
2004/02
- 18 -
De-emphasis Filter
A digital de-emphasis filter is available for 32, 44.1 or 48kHz sampling rates (tc = 50/15
μ
s). In case of double speed and
quad speed mode, the digital de-emphasis filter is always off. In parallel mode, DEM0-1 pins are valid.
DEM1
DEM0
0
0
0
1
1
0
1
1
Mode
44.1kHz
OFF
48kHz
32kHz
Default
Table 11. De-emphasis Filter Control (Normal Speed Mode)
Output Volume
The AK4359 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 12. The attenuation level is calculated by ATT = 20 log
10
(ATT_DATA /
255) [dB] and MUTE at ATT_DATA = “0”.
Sampling Speed
1 Level
Normal Speed Mode
4LRCK
Double Speed Mode
8LRCK
Quad Speed Mode
16LRCK
Transition Time
255 to 0
1020LRCK
2040LRCK
4080LRCK
Table 12. ATT Transition time
Zero Detection
When the input data at all channels are continuously zeros for 8192 LRCK cycles, the AK4359 has Zero Detection like
Table 13. DZF pin immediately goes to “L” if input data of each channel is not zero after going DZF “H”. If RSTN bit is
“0”, DZF pin goes to “H”. DZF pin goes to “L” at 4~5LRCK if input data of each channel is not zero after RSTN bit
returns to “1”. Zero detect function can be disabled by DZFE bit. In this case, all DZF pins are always “L”. When one of
PW1-4 bit is set to “0”, the input data of DAC that the PW bit is set to “0” should be zero in order to enable zero detection
of the other channels. When all PW1-4 bits are set to “0”, DZF pin fixes “L”. DZFB bit can invert the polarity of DZF pin.
DZF Pin
DZF1
ANDed output of zero detection flag of each channel set to “1” in 0CH register
DZF2
ANDed output of zero detection flag of each channel set to “1” in 0DH register
Operations
Table 13. DZF pins Operation
相關(guān)PDF資料
PDF描述
AKD4359 Circular Connector; No. of Contacts:22; Series:MS27484; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:12; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:12-35 RoHS Compliant: No
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