
[AK4673] 
MS0670-E-00 
2007/09 
- 18 - 
Parameter 
External Master Mode
MCKI Input Timing 
Frequency 
Pulse Width Low 
Pulse Width High 
LRCK Output Timing 
Frequency 
DSP Mode: Pulse Width High 
Except DSP Mode: Duty Cycle 
BICK Output Timing 
Period 
Duty Cycle 
Audio Interface Timing (DSP Mode) 
 Master Mode 
 LRCK “
↑
” to BICK “
↑
” (
Note 30
) 
 LRCK “
↑
” to BICK “
↓
” (
Note 31
) 
 BICK “
↑
” to SDTO (BCKP bit = “0”) 
 BICK “
↓
” to SDTO (BCKP bit = “1”) 
 SDTI Hold Time 
 SDTI Setup Time 
 Slave Mode 
 LRCK “
↑
” to BICK “
↑
” (
Note 30
) 
 LRCK “
↑
” to BICK “
↓
” (
Note 31
) 
 BICK “
↑
” to LRCK “
↑
” (
Note 30
) 
 BICK “
↓
” to LRCK “
↑
” (
Note 31
) 
 BICK “
↑
” to SDTO (BCKP bit = “0”) 
 BICK “
↓
” to SDTO (BCKP bit = “1”) 
 SDTI Hold Time 
 SDTI Setup Time 
Audio Interface Timing (Right/Left justified & I
2
S) 
 Master Mode 
 BICK “
↓
” to LRCK Edge (
Note 30
) 
LRCK Edge to SDTO (MSB) 
(Except I
2
S mode) 
 BICK “
↓
” to SDTO 
 SDTI Hold Time 
 SDTI Setup Time 
 Slave Mode 
 LRCK Edge to BICK “
↑
” (
Note 31
) 
 BICK “
↑
” to LRCK Edge (
Note 32
) 
LRCK Edge to SDTO (MSB) 
(Except I
2
S mode) 
 BICK “
↓
” to SDTO 
 SDTI Hold Time 
 SDTI Setup Time 
Note 30. MSBS, BCKP bits = “00” or “11”. 
Note 31. MSBS, BCKP bits = “01” or “10”. 
Note 32. BICK rising edge must not occur at the same time as LRCK edge. 
Symbol
Min 
typ 
max 
Units
256fs 
512fs 
1024fs 
fCLK 
fCLK 
fCLK 
tCLKL 
tCLKH 
1.8816 
3.7632 
7.5264 
0.4/fCLK 
0.4/fCLK 
- 
- 
- 
- 
- 
12.288 
13.312 
13.312 
- 
- 
MHz
MHz
MHz
Ns 
Ns 
fs 
7.35 
- 
- 
- 
48 
- 
- 
kHz
ns 
% 
tLRCKH
Duty 
tBCK 
50 
BCKO bit = “0” 
BCKO bit = “1” 
tBCK 
tBCK 
dBCK 
- 
- 
- 
1/(32fs) 
1/(64fs) 
50 
- 
- 
- 
ns 
ns 
% 
tDBF 
tDBF 
tBSD 
tBSD 
tSDH 
tSDS 
0.5 x tBCK 
 40
0.5 x tBCK 
 40
70 
70 
50 
50 
0.5 x tBCK 0.5 x tBCK + 40
0.5 x tBCK 0.5 x tBCK + 40
- 
- 
- 
- 
ns 
ns 
ns 
ns 
ns 
ns 
70 
70 
- 
- 
tLRB 
tLRB 
tBLR  
tBLR 
tBSD 
tBSD 
tSDH 
tSDS 
0.4 x tBCK 
0.4 x tBCK 
0.4 x tBCK 
0.4 x tBCK 
- 
- 
50 
50 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
- 
ns 
ns 
ns 
ns 
ns 
ns 
ns 
ns 
80 
80 
- 
- 
tMBLR 
tLRD 
tBSD 
tSDH 
tSDS 
40 
70 
70 
50 
50 
- 
- 
- 
- 
- 
40 
70 
70 
- 
- 
ns 
ns  
ns 
ns 
ns 
tLRB 
tBLR 
tLRD 
tBSD 
tSDH 
tSDS 
50 
50 
- 
- 
50 
50 
- 
- 
- 
- 
- 
- 
- 
- 
ns 
ns 
ns  
ns 
ns 
ns 
80 
80 
- 
-