AK4564 Datasheet, PDF (43/48 Pages) Asahi Kasei Microsystems – 16BIT CODEC WITH BUILT-IN ALC AND MIC/HP/SPK-AMP

ASAHI KASEI
[AK4564]
Input Digital ATT Control
Addr
Register Name
0AH Input Digital Volume Control
Default
D7
IVOL7
1
D6
IVOL6
1
D5
IVOL5
1
D4
IVOL4
0
D3
IVOL3
0
D2
IVOL2
0
D1
IVOL1
0
D0
IVOL0
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
+36.0
+6.0
F0H
+35.625
+5.625
EFH
+35.25
+5.25
•
•
E2H
+30.375
•
+0.375
E1H
+30.0
0
Default
E0H
+29.625
-0.375
DFH
+29.25
-0.75
•
•
04H
-52.875
•
-82.875
03H
-53.25
-83.25
02H
-53.625
-83.625
01H
-54
-84
00H
MUTE
MUTE
Table 23. Attenuation value of Input Digital Volume
MS0140-E-01
- 43 -
2002/07