ak4561 AKM Semiconductor, Inc., ak4561 Datasheet - Page 41

• Manufacturer Part Number: ak4561
• Description: 16bit Codec With Built-in Alc And Mic/hp-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
(1). When the input signal exceeds the ALC recovery waiting counter reset level, the ALC recovery operation stops, the
(2). ZTM bit sets zero crossing timeout and WTM bit sets the ALC recovery operation period. When the ALC recovery
Rev. 0.9
Limiter detection level (LMTH)
ALC recovery operation is repeated when input signal level is below “LMTH” again. When the IPGA value by
repeating the ALC recovery operation reaches the reference level (REF6-0 bits), the ALC recovery operation stops.
waiting time (WTM1-0 bits) is shorter than zero crossing timeout period of ZTM1-0 bit, the ALC recovery is operated
by the zero crossing timeout period of ZTM1-0 bit. Therefore, in this case the auto recovery operation period is not
constant.
(1) Recovery waiting counter reset level (LMTH) or reference value of recovery operation (REF6-0)
Zero crossing detect
(2) Zero crossing timeout (ZTM1-0) & Recovery waiting time (WTM1-0)
Figure 29. The continuous ALC Recovery Operation
AKM CONFIDENTIAL
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Gain Level (RATT)
[AK4561]
2000/09