ak4564 AKM Semiconductor, Inc., ak4564 Datasheet - Page 40

• Manufacturer Part Number: ak4564
• Description: 16bit Codec With Built-in Alc And Mic/hp/spk-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
ALC Mode Control 1
MS0140-E-01
Addr
07H
LMAT1-0: ALC1 Limiter ATT Step
RGAIN1-0: ALC1 Recovery GAIN Step
FDATT1-0: FADEIN/OUT ATT Step Setting
GSEL: Select IVOL gain
ALC Mode Control 1
Default
Register Name
LMAT1
The IVOL value is attenuated when the input signal exceeds the ALC1 limiter detection level. The number
of step to attenuate is decided by output level.
During the ALC1 recovery operation, the number of steps changed from current IVOL value is set. For
example, when the current IVOL value is 30H, RGAIN1-0= “01” are set, IVOL changes to 32H by the
auto limiter operation, the input signal level is gained by 0.75dB (=0.375dB x 2).
When the IVOL value exceeds the reference level (REF7-0), the IVOL value does not increase.
During the FADEIN/OUT operation, the number of steps changed from current IVOL value is set.
0
0
1
1
0: MIC (Default)
1: LINE
LMAT0
0
1
0
1
Table 20. FADEIN/OUT ATT Step Setting
D7
ALC1 Output
0
0
Table 19. ALC1 Recovery GAIN Step
RGAIN1
FDATT1
Table 18. ALC1 Limiter ATT Step
LMTH
0
0
1
1
0
0
1
1
1
2
2
2
GSEL
D6
0
RGAIN0
FDATT0
ALC1 Output
- 40 -
FDATT1
0
1
0
1
0
1
0
1
ALC1Limiter ATT Step
D5
0
1
2
2
4
FS
GAIN STEP
FDATT0
ATT STEP
D4
0
ALC1 Output
1
2
3
4
1
2
3
4
FS + 6dB
RGAIN1 RGAIN0 LMAT1 LMAT0
1
2
4
4
D3
0
Default
Default
ALC1 Output
FS + 12dB
D2
0
1
2
4
8
D1
0
Default
[AK4564]
2002/07
D0
0