ASAHI KASEI
[AK4564]
Input Digital ATT Control
Addr
Register Name
D7
D6
D5
D4
D3
D2
D1
D0
0AH
IVOL7 IVOL6 IVOL5
IVOL4 IVOL3 IVOL2 IVOL1 IVOL0
Input Digital Volume Control
Default
1
1
1
0
0
0
0
1
IVOL7•0: Input Digital Volume; 0.375dB step, 242 Level
When the ALC1 operation is OFF, IVOL can be used as volume. When the IVOL is changed, the IVOL
is detected by zero crossing. Zero crossing timeout period is set by ZTM1-0 and FSTM bits.
The change of gain table between MIC and LINE is set by GSEL bit.
During the ALC1 operation, the writing value in IVOL7-0 bits is ignored
GAIN(dB)
DATA
MIC
LINE
(GSEL bit = “0”) (GSEL bit = “1”)
F1H
F0H
EFH
·
+36.0
+35.625
+35.25
·
+6.0
+5.625
+5.25
·
E2H
E1H
E0H
DFH
+30.375
+30.0
+29.625
+29.25
+0.375
0
-0.375
-0.75
Default
·
·
·
04H
03H
02H
01H
-52.875
-53.25
-53.625
-54
-82.875
-83.25
-83.625
-84
00H
MUTE
MUTE
Table 23. Attenuation value of Input Digital Volume
MS0140-E-01
2002/07
- 43 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
