ASAHI KASEI
[AK4388]
Audio Serial Interface Format
Data is shifted in via the SDTI pin using BICK and LRCK inputs. The DIF0-1 as shown in Table 5 can select four serial
data modes. DIF1 pin is internal pull-up pin. In all modes the serial data is MSB-first, 2’s compliment format and is
latched on the rising edge of BICK.
Mode
0
1
2
3
DIF1
L
L
H
H
DIF0
L
H
L
H
SDTI Format
16bit MSB justified
24bit MSB justified
24bit LSB justified
16/24bit I
2
S Compatible
Table 5. Audio Data Formats
BICK
≥32fs
≥48fs
≥48fs
≥48fs
or 32fs
Figure
Figure 1
Figure 2
Figure 3
Figure 4
LRCK
0
1
10
11
12
13
14
15
0
1
10
11
12
13
14
15
0
1
BICK
(32fs)
SDTI
Mode 0
0
15
1
14
6
14
5
15
4
16
3
17
2
1
31
0
0
15
1
14
6
14
5
15
4
16
3
17
2
1
31
0
15
0
14
1
BICK
(64fs)
SDTI
Mode 0
Don’t care
15:MSB, 0:LSB
15
14
0
Don’t care
15
14
0
Lch Data
Rch Data
Figure 1. Mode 0 Timing
LRCK
0
1
8
9
10
11
12
31
0
1
8
9
10
11
12
31
0
1
BICK
(64fs)
SDTI
Mode 1
Don’t care
23
22
21
20
19
0
Don’t care
23
22
21
20
19
0
23:MSB, 0:LSB
Lch Data
Figure 2. Mode 1 Timing
Rch Data
MS0485-E-01
-9-
2006/07
AKM [ ASAHI KASEI MICROSYSTEMS ]
