參數(shù)資料
型號(hào)： AK4353
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： 96kHz 24BIT DAC WITH DIT
中文描述： 96kHz的24位DAC，具有動(dòng)態(tài)網(wǎng)
文件頁(yè)數(shù)： 17/33頁(yè)
文件大?。?/td> 254K
代理商： AK4353
ASAHI KASEI
[AK4353]
MS0016-E-01
2000/07
- 17 -
0
1
1
0
0
0
0
1
Figure 7. A biphase-encoded bit stream
The sub-frame is defined in the figure below:
- Bits 0-3 of the sub-frame represent a preamble for synchronization. There are three preambles:
The block preamble, B, is contained in the first sub-frame of Frame 0.
The channel 1 preamble, M, is contained in the first sub-frame of all other frames.
The channel 2 preamble, W, is contained in all of the second sub-frames.
Table 4 defines the symbol encoding for each of the preambles.
- Bits 4-27 of the sub-frame contain the 24 bit audio sample in 2’s complement format with bit 27 as the most
significant bit (MSB). For 16 bit mode, Bits 4-11 are all 0.
- Bit 28 is the validity flag. This is equal to V bit in the register.
- Bit 29 is a user data bit. This is always “0” in the AK4353.
- Bit 30 is a channel status bit. Frame 0 contains the first bit of the 192 bit word with the last bit in frame 191.
- Bit 31 is an even parity bit for bits 4-31 of the sub-frame.
Sync
P
C
U
V
L M
S Audio sample S
B B
0 3
4 27 28 29 30 31
Figure 8. Sub-frame format
The block of data contains consecutive frames transmitted at a bit rate of 64 times the sample frequency, fs.
Preamble
B
M
W
Preceding state = 0
11101000
11100010
11100100
Preceding state = 1
00010111
00011101
00011011
Table 4. Sub-frame preamble encoding
Figure 9 shows the relation between input data to SDTI pin and audio data on sub-frame.
L M
S Audio sample S
B B
4 27
0
15
0
17
0
19
0
23
Mode 0
Mode 1
Mode 2
Mode 3,4,5
1
2
3
4
5
6
7
8
1
2
3
4
1
2
Sub-frame
Figure 9. Relation between input data to SDTI pin and audio data on sub-frame
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