ak4364 AKM Semiconductor, Inc., ak4364 Datasheet - Page 17

• Manufacturer Part Number: ak4364
• Description: 96khz 24bit ?? Dac With Pll And Dit
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
n TX Output Format
Data input via SDTI pin is formatted in digital interface format and output via TX pin. Data transmitted on the TX output
is formatted in blocks as shown in figure 6. Each block consists of 192 frames. A frame of data contains two sub-frames.
A sub-frame consists of 32 bits of information. Each data bit received 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 1, the second state is the opposite of the first. Figure
7 illustrates a sample stream of 8 data bits encoded in 16 symbol states.
MS0014-E-02
SDTI
LRCK
BICK
(64fs)
M Channel 1 W Channel 2 B Channel 1 W Channel 2 M Channel 1 W Channel 2
0
Frame 191
1
23
23:MSB, 0:LSB
2
22
3
23
Lch Data
0
Figure 7. A biphase-encoded bit stream
1
24
Sub-frame
0
1
Figure 5. Mode 5 Timing
Figure 6. Block format
25
Don’t care
Frame 0
1
31
- 17 -
Sub-frame
0
0
1
0
23
2
22
0
3
1
23
Rch Data
1
Frame 1
24
0
0
25
Don’t care
31
0
[AK4364]
2001/05
1
23