參數(shù)資料
型號(hào)： AK4345
廠商： Asahi Kasei Microsystems Co.,Ltd
英文描述： 100dB 96kHz 24-Bit Stereo 3.3V ツヒ DAC with DIT
中文描述： 100dB的96kHz的24位立體聲3.3ツヒDAC，具有動(dòng)態(tài)網(wǎng)
文件頁(yè)數(shù)： 14/26頁(yè)
文件大?。?/td> 540K
代理商： AK4345
[AK4345]
■
Data Transmission Format
Data transmitted on the TX outputs is formatted in blocks as shown in Figure 14. Each block consists of 192 frames. A
frame of data contains two sub-frames. A sub-frame consists of 32 bits of information. Each received data bit is coded
using a bi-phase mark encoding as a two binary state symbol. The preambles violate bi-phase encoding so they may be
differentiated from data. In bi-phase encoding, the first state of an input symbol is always the inverse of the last state of
the previous data symbol. For a logic 0, the second state of the symbol is the same as the first state. For a logic 1, the
second state is the opposite of the first. Figure 15 illustrates a sample stream of 8 data bits encoded in 16 symbol states.
Frame 191
Frame 0
Frame 1
Sub-frame
Sub-frame
M Channel 1 W Channel 2 B Channel 1 W Channel 2 M Channel 1 W Channel 2
Figure 14. Block format
1
0
0
1
0
0
1
0
Figure 15. A biphase-encoded bit stream
The sub-frame is defined in Figure 16 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 below 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. For 16 bit mode, Bits 4-11 are all 0. Bit 28 is the
validity flag. This is “H” if the audio sample is unreliable. Bit 29 is a user data bit. Frame 0 contains the first bit of a 192
bit user data word. Frame 191 contains the last bit of the user data word. Bit 30 is a channel status bit. Again 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.
0 3
4 27 28 29 30 31
Sync
P
C
U
V
L M
S Audio sample S
B B
Figure 16. Sub-frame format
The block of data contains consecutive frames transmitted at a state-bit rate of 64 times the sample frequency, fs. For
stereophonic audio, the left or A channel data is in channel 1 while the right or B data is in channel 2. For monophonic
audio, channel 1 contains the audio data.
Preamble
Preceding state = 0
B
11101000
M
11100010
W
11100100
Preceding state = 1
00010111
00011101
00011011
Table 4. Sub-frame preamble encoding
■
Channel Status bit
In the consumer mode (bit0 = “0”), bits20-23(audio channel) must be controlled by the CS20 bit. When the CS20 bit is
“1”, the AK4345 corresponds to “stereo mode”, bits20-23 are set to “1000”(left channel) in sub-frame 1, and is set to
“0100”(right channel) in sub-frame 2. When the CS20 bit is “0”, bits20-23 is set to “0000” in both sub-frame 1 and
sub-frame 2.
MS0635-E-00
2007/06
- 14 -
相關(guān)PDF資料
PDF描述
AK4345ET 100dB 96kHz 24-Bit Stereo 3.3V ツヒ DAC with DIT
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