AK4646EN AKM [Asahi Kasei Microsystems], AK4646EN Datasheet - Page 58

• Manufacturer Part Number: AK4646EN
• Description: Stereo CODEC with MIC/SPK-AMP
• Manufacturer: AKM [Asahi Kasei Microsystems]

LFST: Limiter function of ALC when the output was bigger than Fs.
MS0557-E-02
Addr
Addr
06H
07H
ALC2: ALC Enable for Playback
WTM2-0: ALC Recovery Waiting Period (Table 26.)
ZTM1-0: ALC Limiter/Recovery Operation Zero Crossing Timeout Period (Table 25.)
RFST1-0: ALC First recovery Speed(Table 30)
LMTH1-0: ALC Limiter Detection Level / Recovery Counter Reset Level (Table 23.)
RGAIN1-0: ALC Recovery GAIN Step (Table 27.)
LMAT1-0: ALC Limiter ATT Step (Table 24.)
ZELMN: Zero Crossing Detection Enable at ALC Limiter Operation
ALC1: ALC Enable for Recording
0: Output is zero crossing or being changed value of volume at the time of the output is zero crossing time out.
1: When output of ALC is bigger than FS, VOL value is changed instantly.
Default: “00”
Default: “00”
Default: “00”
0: Enable (default)
1: Disable
0: Recording ALC Disable (default)
1: Recording ALC Enable
0: Playback ALC Disable (default)
1: Playback ALC Enable
Register Name
Timer Select
Register Name
ALC Mode Control 1
A period of recovery operation when any limiter operation does not occur during the ALC1 operation
Default is “ 000 ” (128/fs) .
When the IPGA perform zero crossing or timeout, the IPGA value is changed by the μ P WRITE operation,
ALC1 recovery operation. Default is “00” (128/fs).
Default: “ 00 ” (4times)
LMTH1 bit is D6 bit of 0BH.
RGAIN1 bit is D7 bit of 0BH.
Default
Default
R/W
R/W
LFST
R/W
D7
D7
R
0
0
0
WTM2
ALC2
R/W
R/W
D6
D6
0
0
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ZTM1
ALC1
R/W
R/W
D5
D5
0
0
ZELMN
ZTM0
R/W
R/W
D4
D4
0
0
LMAT1
WTM1
R/W
R/W
D3
D3
0
0
LMAT0
WTM0
R/W
R/W
D2
D2
0
0
RGAIN0
RFST1
R/W
R/W
D1
D1
0
0
[AK4646]
LMTH0
RFST0
2007/05
R/W
R/W
D0
D0
0
0