AK4563A Datasheet, PDF (32/39 Pages) Asahi Kasei Microsystems – Low Power 16bit 4ch ADC & 2ch DAC with ALC

ASAHI KASEI
(1) Recovery waiting counter reset level (LMTH) or reference value of recovery operation (REF6-0)
Zero Crossing Detect
[AK4563A]
Gain Level (RATT1-0)
(2) Zero crossing timeout (ZTM1-0) & Recovery waiting time (WTM1-0)
Figure 19. The ALC Recovery Operation
(1) When the input signal exceeds the ALC recovery waiting counter reset level, the ALC recovery operation stops, the
ALC recovery operation is repeated when input signal level is below “ALC recovery waiting counter reset level
(LMTH)” again. When the IPGA value by repeating the ALC recovery operation reaches the reference level (REF6-0
bits), the ALC recovery operation stops also.
(2) ZTM1-0 bits set zero crossing timeout and WTM1-0 bits sets the ALC recovery operation period. When the ALC
recovery 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.
MS0067-E-02
- 32 -
2004/12