ak4368 AKM Semiconductor, Inc., ak4368 Datasheet - Page 25

• Manufacturer Part Number: ak4368
• Description: Dac With Built-in Pll & Hp-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
[2] ALC Recovery Operation
The ALC recovery operation waits for the ROTM1-0 bits (Table 12) to be set after completing the ALC limiter operation.
If the input signal does not exceed “ALC recovery waiting counter reset level” (−8.5dBFS) during the wait time, the ALC
recovery operation is executed. The volume is automatically incremented by the RATT bit (Table 14) up to the set
reference level (REF7-0 bits, Table 15), with zero crossing detection with a timeout period set by the ROTM1-0 bits
(Table 12). Then the volume is set to the same level for both channels. The ALC recovery operation is executed at a period
set by the ROTM1-0 bits. When a zero cross is detected for both channels during the wait period set by the ROTM1-0 bits,
the ALC recovery operation waits until ROTM1-0 period and the next recovery operation is executed.
During ALC recovery operation or recovery waiting, the ALC limiter operation immediately starts if either channel
exceeds the ALC limiter detection level (−6.0dBFS).
When
during the ALC recovery operation, the wait timer of the ALC recovery operation is reset. When
the wait timer of the ALC recovery operation starts.
The ALC operation corresponds to impulse noise. When impulse noise is input, the ALC recovery operation executes
faster than a normal recovery operation.
MS0529-E-00
“ALC recovery waiting counter reset level (−8.5dBFS) ≤ Output Signal < ALC limiter detection level (−6.0dBFS)”
the “ALC recovery waiting counter reset level (−8.5dBFS) > Output Signal”,
Table 15. Reference Level for ALC Recovery operation
RATT
Table 14. ALC Recovery GAIN Step
0
1
REF7-0
C2H
C1H
C0H
BFH
FFH
92H
91H
90H
73H
72H
71H
70H
00H
:
:
:
:
GAIN STEP
GAIN(dB)
Reserved
Reserved
+17.625
−11.625
+17.25
+0.375
−0.375
−11.25
+18.0
−12.0
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1
2
0
:
:
Default
Default
[AK4368EG]
2006/07