ASAHI KASEI
[AK4393]
n Audio Serial Interface Format
Data is shifted in via the SDATA pin using BICK and LRCK inputs. Five data formats are supported and selected by the
DIF0-2 as shown in Table 5. In all formats the serial data is MSB-first, 2's compliment format and is latched on the rising
edge of BICK. Mode 2 can be used for 20 and 16 MSB justified formats by zeroing the unused LSBs.
Mode
DIF2
DIF1
DIF0
Mode
BICK
³32fs
³40fs
³48fs
³48fs
Figure
0
1
2
3
0
0
0
0
0
0
1
1
0
1
0
1
0: 16bit LSB Justified
1: 20bit LSB Justified
2: 24bit MSB Justified
3: I2S Compatible
Figure 1
Figure 2
Figure 3
Figure 4
4
1
0
0
4: 24bit LSB Justified
Figure 2
³48fs
Table 5. Audio Data Formats
LRCK
0
1
10
11
12
13
14
15
0
1
10
11
12
13
14
15
0
1
BICK
(32fs)
SDATA
Mode 0
15 14
6
5
4
3
2
1
0
0
15 14
6
5
4
3
2
1
0
0
15 14
0
1
14
15
16
17
31
0
1
14
15
16
17
31
0
1
BICK
(64fs)
SDATA
Mode 0
Don’t care
15 14
Don’t care
15 14
15:MSB, 0:LSB
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)
SDATA
Mode 1
Don’t care
19
0
0
Don’t care
Don’t care
19
0
19:MSB, 0:LSB
SDATA
Mode 4
Don’t care
23 22 21 20 19
23 22 21 20 19
0
23:MSB, 0:LSB
Lch Data
Rch Data
Figure 2. Mode 1,4 Timing
M0039-E-01
2000/5
- 11 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
