ASAHI KASEI
[AK4380]
n Audio Serial Interface Format
Data is shifted in via the SDTI pin using BICK and LRCK inputs. The DIF0-2 bits as shown in Table 4 can select five
formats in serial mode. In parallel mode, the DIF0 pin as shown Table 5 can select two formats. In all modes 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 16 MSB justified
formats by zeroing the unused LSBs.
Mode DIF2 DIF1 DIF0 SDTI Format
BICK
≥32fs
≥40fs
≥48fs
≥48fs
Figure
0
1
2
3
0
0
0
0
0
0
1
1
0
1
0
1
16bit LSB Justified
20bit LSB Justified
24bit MSB Justified
24bit I2S Compatible
Figure 1
Figure 2
Figure 3
Figure 4
Default
4
1
0
0
24bit LSB Justified
Figure 2
≥48fs
Table 4. Audio Data Formats (Serial mode)
Mode DIF0 SDTI Format
BICK
≥48fs
≥48fs
Figure
Figure 3
Figure 4
2
3
0
1
24bit MSB Justified
24bit I2S Compatible
Table 5. Audio Data Formats (Parallel mode)
LRCK
0
1
10
11
12
13
14
15
0
1
10
11
12
13
14
15
0
1
BICK
(32fs)
SDTI
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)
SDTI
Mode 0
Don’t care
15:MSB, 0:LSB
15 14
Don’t care
15 14
Lch Data
Rch Data
Figure 1. Mode 0 Timing
MS0018-E-01
2000/8
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AKM [ ASAHI KASEI MICROSYSTEMS ]
