AK5385AVS Datasheet, PDF (15/24 Pages) Asahi Kasei Microsystems – 24Bit 192kHz DS ADC

ASAHI KASEI
[AK5385A]
n Audio Interface Format
Two kinds of data formats can be chosen with the DIF pin (Table 4). In both modes, the serial data is in MSB first, 2’s
compliment format. The SDTO is clocked out on the falling edge of BICK. The audio interface supports both master and
slave modes. In master mode, BICK and LRCK are output with the BICK frequency fixed to 64fs and the LRCK frequency
fixed to 1fs.
Mode
0
1
DIF pin
L
H
SDTO
LRCK
24bit, MSB justified H/L
24bit, I²S Compatible L/H
Table 4. Audio Interface Format
BICK
≥ 48fs
≥ 48fs
Figure
Figure 1
Figure 2
LRCK
012
BICK(64fs)
20 21 22 23 24
31 0 1 2
SDTO(o)
23 22
43210
23 22
23:MSB, 0:LSB
Lch Data
Figure 1. Mode 0 Timing
20 21 22 23 24
43210
Rch Data
31 0 1
23
LRCK
0123
BICK(64fs)
21 22 23 24 25
012
21 22 23 24 25
01
SDTO(o)
23 22
43210
23 22
23:MSB, 0:LSB
Lch Data
Figure 2. Mode 1 Timing
43210
Rch Data
n Master Mode and Slave Mode
The M/S pin selects either master or slave modes. M/S pin = “H” selects master mode and “L” selects slave mode. The
AK5385A outputs BICK and LRCK in master mode. In slave mode, provide MCLK, BICK and LRCK.
M/S pin
Mode
BICK, LRCK
L
Slave Mode
BICK = Input
LRCK = Input
H
Master Mode
BICK = Output
LRCK = Output
Table 5. Master mode/Slave mode
MS0265-E-01
- 15 -
2003/11