AK4691EG AKM [Asahi Kasei Microsystems], AK4691EG Datasheet - Page 40

• Manufacturer Part Number: AK4691EG
• Description: 4ch ADC + 2ch DAC with MIC/HP/SPK-AMP
• Manufacturer: AKM [Asahi Kasei Microsystems]

MS0672-E-00
LMTH1
bit
0
0
1
1
ZTM1 bit
ZELMN
bit
0
1
LMTH0
0
0
1
1
bit
0
1
0
1
LMAT1
Table 26. ALC Limiter Detection Level / Recovery Counter Reset Level
ZTM0 bit
ALC Limiter Detection Level
bit
0
0
1
1
x
ALC Output ≥ −2.5dBFS
ALC Output ≥ −4.1dBFS
ALC Output ≥ −6.0dBFS
ALC Output ≥ −8.5dBFS
0
1
0
1
LMAT0
Table 27. ALC Limiter ATT Step (x: Don’t care)
Table 28. ALC Zero Crossing Timeout Period
bit
0
1
0
1
x
1024/fs
128/fs
256/fs
512/fs
(0.375dB)
(0.375dB)
(0.375dB)
Output ≥
(0.75dB)
(0.75dB)
LMTH
2 step
2 step
1 step
1step
1step
ALC
128ms
8kHz
16ms
32ms
64ms
- 40 -
Zero Crossing Timeout Period
(0.375dB)
(0.375dB)
ALC Limiter ATT Step
Output ≥
(0.75dB)
(0.75dB)
ALC Recovery Waiting Counter Reset Level
(1.5dB)
2 step
4 step
2 step
1 step
1step
ALC
FS
−2.5dBFS > ALC Output ≥ −4.1dBFS
−4.1dBFS > ALC Output ≥ −6.0dBFS
−6.0dBFS > ALC Output ≥ −8.5dBFS
−8.5dBFS > ALC Output ≥ −12dBFS
32kHz
16ms
32ms
4ms
8ms
(0.375dB)
(0.375dB)
FS + 6dB
Output ≥
(0.75dB)
(1.5dB)
(1.5dB)
2 step
4 step
4 step
1 step
1step
ALC
FS + 12dB
(0.375dB)
(0.375dB)
(0.75dB)
Output ≥
21.3ms
10.7ms
(3.0dB)
(3.0dB)
48kHz
2.7ms
5.3ms
2 step
8 step
8 step
1 step
1step
ALC
(default)
(default)
(default)
[AK4691]
2007/11