AK4560A Datasheet, PDF (22/47 Pages) Asahi Kasei Microsystems – 16bit CODEC with ALC and MIC/HP/SPK-Amps

ASAHI KASEI
[AK4560A]
Timer Select
Addr
Register Name
D7
D6
D5
D4
D3
D2
D1
D0
04H Timer Select
FDTM1 FDTM0 ZTM1 ZTM0 WTM1 WTM0 LTM1 LTM0
R/W
R/W
RESET
1
0
1
0
1
0
0
0
LTM1-0: ALC1 limiter operation period at zero crossing disable (ZELM = “1”)
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.
LTM1
LTM0
ALC1 Limiter Operation Period
48kHz 44.1kHz 32kHz
0
0
0.5/fs 10us
11us
16us RESET
0
1
1/fs
21us
23us
31us
1
0
2/fs
42us
45us
63us
1
1
4/fs
83us
91us
125us
Table 5. ALC1 Limiter Operation Period at zero crossing disable (ZELM = “1”)
WTM1-0: ALC1 Recovery Waiting Period
A period of recovery operation when any limiter operation does not occur during ALC1
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.
WTM1
WTM0
ALC1 Recovery Operation Waiting Period
48kHz 44.1kHz 32kHz
0
0
512/fs 10.7ms 11.6ms 16.0ms
0
1
1024/fs 21.3ms 23.2ms 32.0ms
1
0
2048/fs 42.6ms 46.4ms 64.0ms RESET
1
1
4096/fs 85.2ms 92.8ms 128.0ms
Table 6. ALC1 Recovery Operation Waiting Period
ZTM1-0: Zero crossing timeout at writing operation by uP and ALC1 recovery operation
When IPGA of each L/R channels do zero crossing or timeout independently, the IPGA value is
changed by uP WRITE operation or ALC1 recovery operation
ZTM1
ZTM0
Zero Crossing Timeout Period
48kHz 44.1kHz 32kHz
0
0
513/fs 10.7ms 11.6ms 16.0ms
0
1
1025/fs 21.4ms 23.2ms 32.0ms
1
0
2049/fs 42.7ms 46.5ms 64.0ms RESET
1
1
4097/fs 85.4ms 92.9ms 128.0ms
Table 7. Zero Crossing Timeout
FDTM1-0: FADEIN/OUT Cycle Setting
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.
FDTM1 FDTM0
FADEIN/OUT Period
48kHz 44.1kHz 32kHz
0
0
512/fs 10.7ms 11.6ms 16.0ms
0
1
1024/fs 21.3ms 23.2ms 32.0ms
1
0
2048/fs 42.6ms 46.4ms 64.0ms RESET
1
1
4096/fs 85.2ms 92.8ms 128.0ms
Table 8. FADEIN/OUT Period
MS0028-E-00
- 22 -
2000/05