AK4951AEN Datasheet, PDF (53/105 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with MIC/HP/SPK-AMP

Table 39. Reference Level of ALC Recovery Operation
REF7-0 bits GAIN (dB)
Step
F1H
F0H
EFH
:
E1H
:
92H
91H
90H
:
06H
05H
04H~00H
+36.0
+35.625
+35.25
:
+30.0
:
+0.375
0.0
–0.375
:
–52.125
–52.5
MUTE
0.375dB ^(default)
[AK4951A]
Table 40. Fast Recovery Speed Setting (FRN bit = “0”)
RFST1-0 bits
Fast Recovery Gain Step [dB]
00
0.0032
(default)
01
0.0042
10
0.0064
11
0.0127
Table 41. Fast Recovery Reference Volume Attenuation Amount
FRATT bit ATT Amount [dB]
ATT Switch
Timing
0
-0.00106
4/fs
(default)
1
-0.00106
16/fs
3. The Volume at ALC Operation
The volume value during ALC operation is reflected in VOL7-0 bits. It is possible to check the current
volume in 0.75dB step by reading the register value of VOL7-0 bits.
Table 42. Value of VOL7-0 bits
VOL7-0 bits
GAIN [dB]
FFH
+36.0 ≤ Gain
FEH
+35.25 ≤ Gain < +36.0
FCH
+34.5 ≤ Gain < +35.25
FAH
+33.75≤ Gain < +34.5
:
:
A2H
+0.75 ≤ Gain < +1.5
A0H
0.0 ≤ Gain < +0.75
9EH
-0.75 ≤ Gain < 0.0
:
:
12H
-53.25 ≤ Gain < -52.5
10H
-72 ≤ Gain < -53.25
00H
MUTE
016001936-E-00
- 53 -
2016/03