AK4122A Datasheet, PDF (18/54 Pages) Asahi Kasei Microsystems – 24-Bit 96kHz SRC with DIR

[AK4122A]
■ Master Mode and Slave Mode
When PORT2 and PORT3 are used as output port, the M/S2 pin and M/S3 pin select either master or slave mode for each
port. “H” is for master mode, and “L” is for slave mode. MCLK should be supplied to the port which is in master mode,
and the AK4122A outputs BICK and LRCK. BICK and LRCK should be supplied externally to the port which is in slave
mode, and MCLK is not needed fro this ports. When PORT2 is used as an input port, the M/S2 pin should be set “H” or
“L”.
M/S2 pin
L
L
H
H
BYPS bit Data I/O
Mode
BICK, LRCK
0
I/O
Slave, SRC
1
Input
Output
Slave, Bypass
Not Available
Input
0
I/O
Master, SRC
Output
1
I/O
Master, Bypass
Table 6. Master mode/Slave mode for PORT2
M/S3 pin
L
L
H
H
BYPS bit Data I/O
Mode
BICK, LRCK
0
Output
Slave, SRC
Input
1
Output Not Available
0
1
Output
Output
Master, SRC
Master, Bypass
Output
Table 7. Master mode/Slave mode for PORT3
■ Audio Interface Format
The audio interface should be controlled during PWN bit = “0”. When in BYPASS mode, BICK1, BICK2 and BICK are
fixed to 64fs.
(1) PORT1
Four types of data formats are available and are selected by setting the DIF1-0 bits. (Table 8) In all modes, the serial data
is in MSB first, 2’s compliment format. The SDTI is latched on the rising edge of BICK1. PORT1 corresponds to slave
mode only.
Mode
0
1
2
3
DIF1
0
0
1
1
DIF0
Input Format
LRCK BICK
0
16bit, LSB justified H/L ≥ 32fs
1 24bit, MSB justified H/L ≥ 48fs
0 24bit, I²S Compatible L/H ≥ 48fs
1
24bit, LSB justified H/L ≥ 48fs
Table 8. Audio Interface Format for PORT1
(default)
Note: The DIF1-0 bits of the PORT1 must not be set “10” (I²S Compatible) when the DIR is
selected as an input port.
MS1076-E-01
- 18 -
2010/05