ASAHI KASEI
[AK4352]
n Audio Serial Interface Format
The AK4352 interfaces with external system by using SDATA, BICK and LRCK pins. Four types of data format are
available and one of them is selected by setting DIF0 and DIF1. Format 0 is compatible with existing 16bit DACs and
digital filters. Format 1 is an 18bit version of format 0. Format 2 is similar to AKM ADCs and many DSP serial ports.
Format 3 is compatible with the I2S serial data protocol. In format 2 and 3, 16bit data followed by two zeros also could
be input. In all modes, the serial data is MSB first and 2’s complement format.
DIF1
DIF0
Mode
BICK
≥32fs
≥36fs
Figure
Figure 2
Figure 2
Figure 3
Figure 4
0
0
1
1
0
1
0
1
0: 16bit LSB Justified
1: 18bit LSB Justified
2: 18bit MSB Justified
3: I2S Compatible
≥36fs
≥32fs or 36fs
Table 2. Digital Input Formats
Rch
LRCK
BICK
Lch
SDATA
Mode 0
0
0
Don’t care
15:MSB, 0:LSB (@16bit Data)
Don’t care 17 16 15 14
15 14
Don’t care
Don’t care
15 14
15 14
0
0
SDATA
Mode 1
17 16
17:MSB, 0:LSB (@18bit Data)
*Mode 1: BICK needs 36fs or more than 36fs.
Figure 2. Mode 0,1 Timing
Rch
Lch
LRCK
BICK
Don’t
Don’t
care
15 14
17 16
1
0
15 14
1
3
0
2
SDATA
16bit
15 14
17 16
care
Don’t
Don’t
care
3
2
0
SDATA
18bit
1
17 16
1
0
care
* BICK needs 36fs or more than 36fs.
Figure 3. Mode 2 Timing
M0040-E-02
2000/11
- 8 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
