AK4569 Datasheet, PDF (15/45 Pages) Asahi Kasei Microsystems – 20-Bit Stereo CODEC with IPGA & HP-AMP

ASAHI KASEI
[AK4569]
„ Serial Data Interface
The AK4569 interfaces with external systems via the BICK, LRCK, SDTO and SDTI pins. Four data formats are
available and are selected by setting DIF1 and DIF0 bits (Table 3). Mode 0 of SDTI is compatible with existing 16bit
DACs and digital filters. Mode 1 of SDTI is a 20bit version of Mode 0. Mode 2 of SDTI is similar to AKM ADCs and
many DSP serial ports. Mode 3 is compatible with the I²S serial data protocol. In SDTI Modes 2 and 3, the following
formats are also valid: 16-bit data followed by four zeros and 18-bit data followed by two zeros. In all modes, the serial
data is MSB first and 2’s complement format.
Mode
0
1
2
3
DIF1
0
0
1
1
DIF0
0
1
0
1
SDTO
20bit, MSB justified
20bit, MSB justified
20bit, MSB justified
IIS (I²S)
SDTI
16bit, LSB justified
20bit, LSB justified
20bit, MSB justified
IIS (I²S)
BICK
≥ 32fs
≥ 40fs
≥ 40fs
32fs or ≥ 40fs
LRCK
H/L
H/L
H/L
L/H
Default
Table 3. Audio Data Format
LRCK
01 2
BICK(64fs)
SDTO(o)
19 18
16 17 18 19 20 21
4 3 2 10
31 0 1 2
16 17 18 19 20 21
19 18
4 3 2 10
31 0 1
19
SDTI(i)
Don’t Care 15 14 13 12 11
1 0 Don’t Care 15 14 13 12 11
10
01 2
BICK(32fs)
8 9 10 11 12 13 14 15 0 1 2
8 9 10 11 12 13 14 15 0 1
SDTO(o)
19 18
12 11 10 9 8 7 6 5 4 19 18
12 11 10 9 8 7 6 5 4 19
SDTI(i)
15 14
8 7 6 5 4 3 2 1 0 15 14
Lch Data
Figure 10. Mode 0 Timing
8 7 6 5 4 3 2 1 0 15
Rch Data
LRCK
BICK(64fs)
01 2
SDTO(o)
19 18
12 13 14
20 21
876
0
31 0 1 2
12 13 14
20 21
19 18
876
0
31 0 1
19
SDTI(i)
Don’t Care
19 18
12 11
Lch Data
1 0 Don’t Care
19 18
12 11
Rch Data
10
Figure 11. Mode 1 Timing
MS0292-E-01
- 15 -
2005/07