AK4561 Datasheet, PDF (39/48 Pages) Asahi Kasei Microsystems – 16bit CODEC with built-in ALC and MIC/HP-Amp

ASAHI KASEI
AKM CONFIDENTIAL
(3) Zero crossing timeout (ZTM1-0)
Limiter detection level (LMTH)
(1)
[AK4561]
ATT level (LMAT1-0)
(2)
(2)
Recovery waiting counter reset level (LMTH)
(1)
Limiter detection level (LMTH)
(3) Zero crossing timeout (ZTM1-0)
ATT level (LMAT1-0)
Figure 27. In case of continuing the limiter operation (ZELM = “1”)
(1) When the input level exceeds the ALC limiter detection level, the ALC limiter operation starts. Zero crossing counter
starts at the same time.
(2) Zero crossing detection. When the input signal is detected, the IPGA value is attenuated until the value set by
LMAT1-0 and the ALC limiter operation is finished.
(3) Zero crossing timeout is set by ZTM1-0 bits. But the first zero crossing timeout cycle after starting the limiter
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)
Rev. 0.9
- 39 -
2000/09