AK4637 Datasheet, PDF (75/96 Pages) Asahi Kasei Microsystems – 24bit Mono CODEC with MIC - SPK-AMP

[AK4637]
Addr
0AH
Register Name
ALC Timer Select
R/W
Default
D7
D6
D5
D4
D3
D2
D1
D0
0
IVTM EQFC1 EQFC0 WTM1 WTM0 RFST1 RFST0
R
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
1
1
0
0
0
0
0
RFST1-0: ALC First Recovery Speed (Table 34)
Default: “00” (0.0032dB)
WTM1-0: ALC Recovery Waiting Period (Table 31)
Default: “00” (128/fs)
EQFC1-0: ALCEQ Frequency Setting (Table 28)
Default: “10” (Extreme value=150Hz, Zero point=100Hz @ fs = 48kHz)
IVTM: Input Digital Volume Soft Transition Time Setting (Table 40)
0: 236/fs
1: 944/fs (default)
A transition time when changing IVOL7-0 bits to F1H from 05H.
Addr
0BH
Register Name
ALC Mode Control 1
R/W
Default
D7
ALCEQN
R/W
0
D6
LMTH2
R/W
0
D5
D4
D3
D2
D1
D0
ALC RGAIN2 RGAIN1 RGAIN0 LMTH1 LMTH0
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
LMTH2-0: ALC Limiter Detection Level / Recovery Counter Reset Level (Table 29)
Default: “000”
RGAIN2-0: ALC Recovery Gain Step (Table 32)
Default: “000” (0.00424dB)
ALC: ALC Enable
0: ALC Disable (default)
1: ALC Enable
ALCEQN: ALC EQ Enable
0: ALC EQ On (default)
1: ALC EQ Off
Addr
0CH
Register Name
ALC Mode Control 2
R/W
Default
D7
REF7
R/W
1
D6
REF6
R/W
1
D5
REF5
R/W
1
D4
REF4
R/W
0
D3
REF3
R/W
0
D2
REF2
R/W
0
D1
REF1
R/W
0
D0
REF0
R/W
1
REF7-0: Reference Value at ALC Recovery Operation. 0.375dB step, 242 Level (Table 33)
Default: “E1H” (+30.0dB)
015010680-E-00
- 75 -
2015/09