AK4137EQ Datasheet, PDF (34/65 Pages) Asahi Kasei Microsystems – 32bit SRC with PCM/DSD conversion

[AK4137]
■ System Clock and Audio Interface Format for Input PORT
The audio data format of input port is MSB first, 2’s complement format. The SDTI is latched on the
rising edge of IBICK.
In parallel control mode (PSN pin= “H”), IDIF2-0 pins control all audio interface formats of the input
port. IDIF2-0 pins must be set during the PDN pin= “L”.
In serial control mode (PSN pin = “L”), the setting of IDIF2-0 pins is ignored and IDIF[2:0] bits setting
is reflected. IDIF[2:0] bits should be changed after all SDTO output codes become zero during soft
mute by SMUTE bit = “1” or the SMUTE pin = “H”.
IDIF2
Mode Pin
(Note 21)
IDIF1
Pin
(Note 21)
IDIF0
Pin
(Note 21)
SDTI Format
ILRCK IBICK
IBICK
Freq
0
L
L
L
32bit, LSB justified
 64FSI
1
L
L
H
24bit, LSB justified
 48FSI
2
L
H
L
32bit, MSB justified
 64FSI
3
L
H
H
32 or 16 bit, I²S Compatible
16 bit, I²S Compatible
Input
 64FSI
Input 32FSI
4
H
L
L
TDM 32bit, MSB justified
5
H
L
H
TDM 32bit, I²S Compatible
256FSI
6
H
H
L
TDM 32bit, MSB justified
7
H
H
H
TDM 32bit, I²S Compatible
Note 20. When IBICK = 32FSI, the AK4137 only supports 16-bit LSB justified and 16-bit I²S
Compatible formats.
Note 21. In serial control mode (PSN pin = “L”), the setting of IDIF2-0 pins is ignored.
512FSI
Table 1. Input PORT Audio Interface Format (Parallel Control mode, PSN pin = “H”)
Rev. 0.2
- 34 -
2014/06