AK4118A Datasheet, PDF (32/56 Pages) Asahi Kasei Microsystems – High Feature 192kHz 24bit Digital Audio I/F Transceiver

[AK4118A]
■ Audio Serial Interface Format
The DIF0, DIF1 and DIF2 pins can select eight serial data formats as shown in Table 17. In all formats the serial data is
MSB-first, 2's compliment format. The SDTO is clocked out on the falling edge of BICK and the DAUX is latched on
the rising edge of BICK. BICK outputs 64fs clock in Mode 0-5. Mode 6-7 are Slave Modes, and BICK is available up to
128fs at fs=48kHz. In the format equal or less than 20bit (Mode0-2), LSBs in sub-frame are truncated. In Mode 3-7, the
last 4LSBs are auxiliary data (Figure 29).
When the Parity Error occurs in a sub-frame, the AK4118A continues to output the last normal sub-frame data from
SDTO repeatedly until the error is removed. When the Unlock Error occurs, the AK4118A outputs “0” data from the
SDTO pin. In case of using the DAUX pin, the data is transformed and output from SDTO. The DAUX pin is used in
Clock Operation Mode 1/3 and unlock state of Mode 2.
The input data format to DAUX should be left justified except in Mode5 and Mode7 (Table 17). In Mode5 or Mode7,
both the input data format of DAUX and output data format of SDTO are I²S. Mode6 and Mode7 are Slave Mode that is
corresponding to the Master Mode of Mode4 and Mode5. In salve Mode, LRCK and BICK should be fed with
synchronizing to MCKO1/2.
sub-frame of IEC60958
0
34
78
preamble Aux.
LSB
MSB
11 12
23
AK4118 Audio Data (MSB First)
27 28 29 30 31
VUC P
MSB
LSB
0
Figure 29. Bit Configuration
Mode DIF2 DIF1 DIF0
DAUX
0
0
0
0 24bit, Left justified
1
0
0
1 24bit, Left justified
2
0
1
0 24bit, Left justified
3
0
1
1 24bit, Left justified
4
1
0
0 24bit, Left justified
5
1
0
1 24bit, I²S
6
1
1
0 24bit, Left justified
7
1
1
1 24bit, I²S
SDTO
16bit, Right justified
18bit, Right justified
20bit, Right justified
24bit, Right justified
24bit, Left justified
24bit, I²S
24bit, Left justified
24bit, I²S
LRCK
I/O
H/L O
H/L O
H/L O
H/L O
H/L O
L/H O
H/L I
L/H I
BICK
I/O
64fs
O
64fs
O
64fs
O
64fs
O
64fs
O
64fs
O
64-128fs I
64-128fs I
(default)
Table 17. Audio Data Format
MS1130-E-02
- 32 -
2009/12