AK4691 Datasheet, PDF (71/80 Pages) Asahi Kasei Microsystems – 4ch ADC + 2ch DAC with MIC/HP/SPK-AMP

[AK4691]
Addr
0AH
Register Name
Timer Select
R/W
Default
D7
D6
D5
D4
D3
D2
D1
D0
FDTM1 FDTM0
0
ZTM1 ZTM0 WTM2 WTM1 WTM0
R/W
R/W
RD
R/W
R/W
R/W
R/W
R/W
0
1
0
0
0
1
0
0
WTM2-0: ALC Recovery Waiting Period (Table 29)
Default: “100” (2048/fs)
ZTM1-0: ALC Limiter/Recovery Operation Zero Crossing Timeout Period (Table 28.)
Default: “00” (128/fs)
FDTM1-0: FADEIN/OUT Cycle Setting (Table 34)
Default: “01” (2048/fs)
Addr
0BH
Register Name
ALC Mode Control 1
R/W
Default
D7
D6
D5
D4
D3
D2
D1
D0
0
ZELMN FDATT1 FDATT0 RGAIN1 RGAIN0 LMAT1 LMAT0
RD
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
LMAT1-0: ALC Limiter ATT Step (Table 27)
Default: “00”
RGAIN1-0: ALC Recovery GAIN Step (Table 30)
Default: “00”
FDATT1-0: FADEIN/OUT ATT Step Setting (Table 35)
Default: “00”
ZELMN: Zero Crossing Detection Enable at ALC Limiter Operation
0: Enable (default)
1: Disable
Addr Register Name
D7
0CH ALC Mode Control 2
0
R/W
RD
Default
0
D6
D5
D4
D3
D2
D1
D0
0
LFST RFST1 RFST0 GSEL LMTH1 LMTH0
RD
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
LMTH1-0: ALC Limiter Detection Level / Recovery Counter Reset Level (Table 26)
Default: “00”
GSEL: Select IVOL Gain
0: MIC (default)
1: LINE
RFST1-0: ALC First limiter/recovery Speed (Table 32)
Default: “00” (4 times)
LFST: Setting of Limiter operation when input signal exceeds full-scale level
0: IVL/R values are changed at zero-crossing detection or zero-crossing timeout. (default)
1: IVL/R values are immediately (period: 1/fs) attenuated by 1step when ALC output signal exceeds full-scale level.
MS0672-E-00
- 71 -
2007/11