ak4561 AKM Semiconductor, Inc., ak4561 Datasheet - Page 39

• 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 level exceeds the ALC limiter detection level, the ALC limiter operation starts. Zero crossing counter
(2) Zero crossing detection. When the input signal is detected, the IPGA value is attenuated until the value set by
(3) Zero crossing timeout is set by ZTM1-0 bits. But the first zero crossing timeout cycle after starting the limiter
Rev. 0.9
starts at the same time.
LMAT1-0 and the ALC limiter operation is finished.
operation may be the short cycle by the state of the last zero crossing counter. (For example, in case of doing the
limiter operation during the recovery operation)
Limiter detection level (LMTH)
Recovery waiting counter reset level (LMTH)
Limiter detection level (LMTH)
Figure 27. In case of continuing the limiter operation (ZELM = “1”)
(3) Zero crossing timeout (ZTM1-0)
(1)
AKM CONFIDENTIAL
(3) Zero crossing timeout (ZTM1-0)
(2)
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(1)
(2)
ATT level (LMAT1-0)
ATT level (LMAT1-0)
[AK4561]
2000/09