ASAHI KASEI
[AK4367]
Serial Data Interface
The AK4367 interfaces with external system via the SDATA, BICK and LRCK pins. Five data formats are available and
are selected by setting DIF2, DIF1 and DIF0 bits (Table 3). Mode 0 is compatible with existing 16bit DACs and digital
filters. Mode 1 is a 20bit version of Mode 0. Mode 4 is a 24bit version of Mode 0. Mode 2 is similar to AKM ADCs and
many DSP serial ports. Mode 3 is compatible with the I2S serial data protocol. In Modes 2 and 3 with BICK≥48fs, the
following formats are also valid: 16-bit data followed by eight zeros (17th to 24th bits) and 20-bit data followed by four
zeros (21st to 24th bits). In all modes, the serial data is MSB first and 2’s complement format.
DIF2 bit
DIF1 bit
DIF0 bit
MODE
BICK
32fs ≤ BICK ≤ 64fs
40fs ≤ BICK ≤ 64fs
Figure
Figure 10
Figure 11
Figure 12 Default
Figure 13
0
0
0
0
1
0
0
1
1
0
0
1
0
1
0
0: 16bit, LSB justified
1: 20bit, LSB justified
2: 24bit, MSB justified
3: I2S Compatible
48fs ≤ BICK ≤ 64fs
BICK=32fs or 48fs ≤ BICK ≤ 64fs
48fs ≤ BICK ≤ 64fs
4: 24bit, LSB justified
Figure 11
Table 3. Audio Data Format
LRCK
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
BICK
SDATA
Mode 0
Don’t care
15 14
Don’t care
15 14
15:MSB, 0:LSB
Lch Data
Rch Data
Figure 10. Mode 0 Timing
LRCK
BICK
SDATA
Mode 1
Don’t care
19
0
0
Don’t care
Don’t care
19
0
0
19:MSB, 0:LSB
SDATA
Mode 4
Don’t care
23 22 21 20 19
23 22 21 20 19
23:MSB, 0:LSB
Lch Data
Rch Data
Figure 11. Mode 1, 4 Timing
MS0247-E-02
2005/10
- 14 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
