AK4640_05 AKM [Asahi Kasei Microsystems], AK4640_05 Datasheet - Page 58

• Manufacturer Part Number: AK4640_05
• Description: 16-Bit ?? CODEC with MIC/HP/SPK-AMP
• Manufacturer: AKM [Asahi Kasei Microsystems]

ASAHI KASEI
MS0273-E-02
Addr
0AH
ALC1: ALC1 Enable
ALC2: ALC2 Enable
REF6-0:
0: ALC1 Disable (Default)
1: ALC1 Enable
0: ALC2 Disable
1: ALC2 Enable (Default)
Register Name
ALC Mode Control 2
During the ALC1 recovery operation, if the IPGA value exceeds the setting reference value by gain operation,
then the IPGA does not become larger than the reference value. For example, when REF7-0 = “30H”, RATT
= 2step, IPGA = 2FH, even if the input signal does not exceed the “ALC1 Recovery Waiting Counter Reset
Level”, the IPGA does not change to 2FH + 2step = 31H, and keeps 30H. Default is “36H”.
Default
Reference value at ALC1 Recovery Operation (see Table 31)
R/W
Table 31. Setting Reference Value at ALC1 Recovery Operation
DATA (HEX)
47
46
45
36
10
06
05
04
03
02
01
00
:
:
:
RD
D7
0
0
REF6
R/W
GAIN (dB)
D6
0
+27.5
+27.0
+26.5
+19.0
+0.0
−5.0
−5.5
−6.0
−6.5
−7.0
−7.5
−8.0
:
:
:
- 58 -
REF5
R/W
D5
1
STEP
0.5dB
REF4
R/W
D4
1
REF3
R/W
D3
Default
0
REF2
R/W
D2
1
REF1
R/W
D1
1
[AK4640]
2005/04
REF0
R/W
D0
0