參數(shù)資料
型號: AK4343
廠商: Asahi Kasei Microsystems Co.,Ltd
英文描述: Stereo DAC with HP/RCV/SPK-AMP
中文描述: 立體聲DAC惠普/垃圾車/胰腎聯(lián)合移植腺苷
文件頁數(shù): 43/98頁
文件大小: 851K
代理商: AK4343
ASAHI KASEI
[AK4343]
MS0478-E-01
2006/10
- 43 -
3. Example of ALC Operation
Table 31 shows the examples of the ALC setting.
fs=8kHz
Operation
4.1dBFS
Enable
32ms
fs=44.1kHz
Operation
4.1dBFS
Enable
23.2ms
Register Name
Comment
Data
01
0
01
Data
01
0
11
LMTH1-0
ZELMN
ZTM1-0
Limiter detection Level
Limiter zero crossing detection
Zero crossing timeout period
Recovery waiting period
*WTM2-0 bits should be the same or
longer data as ZTM1-0 bits.
Maximum gain at recovery operation
WTM2-0
001
32ms
011
23.2ms
REF7-0
AVL7-0,
AVR7-0
LMAT1-0
RGAIN1-0
RFST1-0
ALC
E1H
+30dB
E1H
+30dB
Gain of AVOL
E1H
+30dB
E1H
+30dB
Limiter ATT step
Recovery GAIN step
Fast Recovery Speed
ALC enable
00
00
00
1
1 step
1 step
4 times
Enable
00
00
00
1
1 step
1 step
4 times
Enable
Table 31. Example of the ALC setting
The following registers should not be changed during the ALC operation. These bits should be changed after the ALC
operation is finished by ALC bit = “0” or PMDAC bit = “0”.
LMTH1-0, LMAT1-0, WTM2-0, ZTM1-0, RGAIN1-0, REF7-0, ZELMN, RFST1-0
Manual Mode
* The value of AVOL should be
the same or smaller than REF’s
WR (ZTM1-0, WTM2-0, RFST1-0)
WR (REF7-0)
WR (AVL/R7-0)
WR (LMAT1-0, RGAIN0, ZELMN, LMTH0; ALC= “1”)
Example:
Limiter = Zero crossing Enable
Recovery Cycle = 32ms@8kHz
Limiter and Recovery Step = 1
Maximum Gain = +30.0dB
Limiter Detection Level =
4.1dBFS
ALC bit = “1”
(1) Addr=06H, Data=14H
(2) Addr=08H, Data=E1H
(5) Addr=07H, Data=01H
(3) Addr=09H&0CH, Data=E1H
ALC Operation
Note : WR : Write
WR (RGAIN1, LMTH1)
(4) Addr=0BH, Data=00H
Figure 33. Registers set-up sequence at ALC operation
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