ak4635ecb AKM Semiconductor, Inc., ak4635ecb Datasheet - Page 48

• Manufacturer Part Number: ak4635ecb
• Description: 16-bit Mono Codec With Alc & Mic/spk/video-amp
• Manufacturer: AKM Semiconductor, Inc.

3. The Volume at the ALC Operation
The current volume value at the ALC operation is reflected by VOL7-0 bits. It is enable to check the current volume value
by reading the register value of VOL7-0 bits.
This function is available only at the time of 3-wire mode. The volume value at the ALC operation can
not be read in I
4. Example of the ALC Operation for Recording Operation
Table 34
Rev. 0.6
Register Name
LMTH1-0
ZELM
ZTM1-0
WTM2-0
IREF7-0
IVOL7-0
LMAT1-0
LFST
RGAIN1-0
ALC1
FRSL1-0
shows the examples of the ALC setting for mic recording.
2
C mode.
Comment
Limiter detection Level
Limiter zero crossing detection
Zero crossing timeout period
Recovery waiting period
*WTM1-0 bits should be more than or
Maximum gain at recovery operation
Gain of IVOL
Limiter ATT step
Fast Limiter Operation
Recovery GAIN step
ALC enable
Speed of Fast Recovery
equal to ZTM1-0 bits
Table 34. Example of the ALC Setting (Recording)
Table 33. Value of VOL7-0 bits
VOL7-0bits
EFH
C5H
F1H
F0H
92H
91H
90H
2H
1H
0H
:
:
:
- 48 -
Data
C5H
C5H
000
GAIN(0dB)
01
00
00
00
00
0
1
1
+35.625
+35.25
+0.375
MUTE
+36.0
+19.5
53.625
0.375
0.0
54.0
:
:
:
fs=8kHz
Operation
4.1dBFS
19.5dB
19.5dB
4 times
Enable
Enable
1 step
16ms
16ms
1step
ON
C5H
Data
C5H
001
01
01
00
00
00
0
1
1
fs=16kHz
Operation
4.1dBFS
19.5dB
19.5dB
Enable
Enable
4times
1 step
16ms
16ms
1step
ON
[AK4635]
2007/10