ak4561 AKM Semiconductor, Inc., ak4561 Datasheet - Page 22

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

ASAHI KASEI
Timer Select
Rev. 0.9
Addr
04H
ZTM1-0: Zero crossing timeout at writing operation by P and ALC recovery operation and the zero crossing enable
FDTM1-0: FADEIN/OUT Cycle Setting
LTM1-0: ALC limiter operation period at zero crossing disable (ZELM = “0”)
WTM1-0: ALC Recovery Waiting Period
Timer Select
(ZELM= “1”) of the ALC operation
RESET
Register Name
Table 6. ALC Limiter Operation Period at zero crossing disable (ZELM = “0”)
The IPGA value is changed immediately. When the IPGA value is changed continuously, the
change is done by the period specified by LTM1-0 bits.
A period of recovery operation when any limiter operation does not occur during ALC operation.
Recovery operation is done at period set by WTM1-0 bits.
When the input signal level exceeds auto recovery waiting counter reset level set by LMTH bit,
the auto recovery waiting counter is reset.
The waiting timer starts when the input signal level becomes below the auto recovery waiting
counter reset level.
These periods are value at fs=32kHz (FS bit = “0”) or fs=48kHz (FS bit = “1”).
When IPGA of each L/R channels do zero crossing or timeout independently, the IPGA value is
changed by P WRITE operation or ALC recovery operation or ALC limiter operation (ZELM =
“1”).
These periods are value at fs=32kHz (FS bit = “0”) or fs=48kHz (FS bit = “1”).
The FADEIN/OUT operation is done by a period set by FDTM1-0 bits when FDIN or FDOUT
bits are set to “1”. When IPGA of each L/R channel do zero crossing or timeout independently,
the IPGA value is changed.
These periods are value at fs=32kHz (FS bit = “0”) or fs=48kHz (FS bit = “1”).
LTM1
0
0
1
1
Table 7. ALC Recovery Operation Waiting Period
FDTM1 FDTM0
D7
FDTM1
WTM1
1
ZTM1
LTM0
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
Table 8. Zero Crossing Timeout
Table 9. FADEIN/OUT Period
AKM CONFIDENTIAL
D6
0
FDTM0
WTM0
ZTM0
1/fs
2/fs
4/fs
8/fs
0
1
0
1
0
1
0
1
0
1
0
1
- 22 -
ZTM1
D5
ALC Limiter Operation Period
1
167 s
48kz
21 s
42 s
83 s
128.0ms
128.0ms
128.0ms
ZTM0
16.0ms
32.0ms
64.0ms
16.0ms
32.0ms
64.0ms
16.0ms
32.0ms
64.0ms
Period
Period
Period
D4
0
44.1kHz
181 s
23 s
45 s
91 s
WTM1
D3
1
RESET
RESET
RESET
32kHz
WTM0
125 s
250 s
31 s
63 s
D2
0
RESET
LTM1
D1
0
[AK4561]
LTM0
2000/09
D0
0