AK4367 Datasheet, PDF (14/38 Pages) Asahi Kasei Microsystems – OUTPUT MIXER & HP - AMP 24 BIT 2 CH DAC

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
0
0
0
0
1
DIF1 bit
0
0
1
1
0
DIF0 bit
0
1
0
1
0
MODE
BICK
0: 16bit, LSB justified
32fs ≤ BICK ≤ 64fs
1: 20bit, LSB justified
40fs ≤ BICK ≤ 64fs
2: 24bit, MSB justified
48fs ≤ BICK ≤ 64fs
3: I²S Compatible BICK=32fs or 48fs ≤ BICK ≤ 64fs
4: 24bit, LSB justified
48fs ≤ BICK ≤ 64fs
Table 3. Audio Data Format
Figure
Figure 10
Figure 11
Figure 12
Figure 13
Figure 11
Default
LRCK
BICK
(32fs)
SDATA
Mode 0
BICK
15 14
6 5 4 3 2 1 0 15 14
6 5 4 3 2 1 0 15 14
SDATA
Mode 0
Don’t care
15:MSB, 0:LSB
15 14
0 Don’t care
15 14
0
Lch Data
Rch Data
Figure 10. Mode 0 Timing
LRCK
BICK
SDATA
Mode 1
Don’t care
19:MSB, 0:LSB
19
0 Don’t care
19
0
SDATA
Don’t care 23 22 21 20 19
0 Don’t care 23 22 21 20 19
0
Mode 4
23:MSB, 0:LSB
Lch Data
Rch Data
Figure 11. Mode 1, 4 Timing
MS0247-E-01
- 14 -
2004/11