AK4137EQ Datasheet, PDF (39/65 Pages) Asahi Kasei Microsystems – 32bit SRC with PCM/DSD conversion

[AK4137]
■ Audio Interface Format for Output PORT
The ODIF1-0 pins and OBIT1-0 pins select the audio interface format for the output port. The audio
data is MSB first, 2’s complement format. The SDTO is clocked out on the falling edge of OBICK.
Select the audio interface format for output port while the PDN pin = “L”. If the AK4137 is in slave
mode at bypass mode, IBICK and OBICK must be synchronized but the phase is not critical. ILRCK
and OLRCK must be synchronized but the phase is not critical. The audio interface format of SDTO
is controlled by ODIF1-0 pins, OBIT1-0 pins and TDM pin.
Output ports become TDM mode when the TDM pin = “H”. 6channels or 14channels serial data
should be input to the XTI/OMCLK/TDMI pin. In TDM mode, XTI/OMCLK data is ignored internally.
The SDTI pin outputs serial data for 8channels or 16channels.
Mode
0
1
2
3
4
5
6
7
TDM ODIF1 ODIF0
SDTO Format
L
L
L
L
L
H
LSB justified
I²S Compatible
L
H
L
L
H
H
MSB justified
I²S Compatible
H
L
L
H
L
H
TDM256 mode 32bit MSB justified
TDM256 mode 32bit I²S Compatible
H
H
L
H
H
H
TDM512 mode 32bit MSB justified
TDM512 mode 32bit I²S Compatible
Table 4. Output PORT Audio Interface Format 1
Mode
0
1
2
3
4
5
6
7
8
9
10
11
TDM
pin
L
H
Master / Slave
setting
OBIT1
pin
OBIT0
pin
SDTO
pin
OLRCK
OBICK
Slave
L
(CM3-0 =
L
“LHLL”/“LHHL”/
H
L
32bit
H
L
24bit
20bit
Input
Input
“Hxxx”)
H
H 16bit
L
Master
L
(Except CM3-0 =
“LHLL”/“LHHL”)
H
H
L
32bit
H
L
24bit
20bit
Output Output
H 16bit
Slave
(CM3-0 =
“LHLL”/“LHHL”/
*
“Hxxx”)
TDM
* mode Input Input
32bit
Table 5. Output PORT Audio Interface Format 2
OBICK Frequency
MSB
LSB
justified, I²S justified
 64FSO
 48FSO
 40FSO
64FSO
 32FSO
64FSO
256FSO
512FSO
(*: The data length for 1channel is 32bit fixed in TDM mode. The OBIT1-0 pin settings are ignored.
Connect these pins to DVSS.)
Rev. 0.2
- 39 -
2014/06