AK4637 Datasheet, PDF (53/96 Pages) Asahi Kasei Microsystems – 24bit Mono CODEC with MIC - SPK-AMP

[AK4637]
REF7-0 bits GAIN (dB)
Step
F1H
+36.0
F0H
+35.625
EFH
+35.25
:
:
E1H
:
+30.0
:
0.375dB ^(default)
92H
+0.375
91H
0.0
90H
–0.375
:
:
06H
–52.125
05H
–52.5
04H~00H
MUTE
Table 33. Reference Level of ALC Recovery Operation
RFST1-0 bits Fast Recovery Gain Step [dB]
00
0.0032
(default)
01
0.0042
10
0.0064
11
0.0127
Table 34. Fast Recovery Speed Setting (FRN bit = “0”)
FRATT bit ATT Amount [dB]
ATT Switch
Timing
0
-0.00106
4/fs
(default)
1
-0.00106
16/fs
Table 35. Fast Recovery Reference Volume Attenuation Amount
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.
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
Table 36. Value of VOL7-0 bits
015010680-E-00
- 53 -
2015/09