參數(shù)資料
型號: AK4671EG
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: Stereo CODEC with MIC/RCV/HP-AMP
中文描述: 立體聲編解碼器麥克風(fēng)/垃圾車/惠普腺苷
文件頁數(shù): 72/164頁
文件大?。?/td> 1792K
代理商: AK4671EG
[AK4671]
MS0666-E-00
2007/10
- 72 -
Input Digital Volume (Manual Mode)
The input digital volume becomes a manual mode when ALC bit is “0”. This mode is used in the case shown below.
1.
After exiting reset state, set-up the registers for the ALC operation (ZTM1-0, LMTH1-0 and etc)
2.
When the registers for the ALC operation (Limiter period, Recovery period and etc) are changed.
For example, in case of changing the sampling frequency.
3.
When IVOL is used as a manual volume.
IVL7-0 and IVR7-0 bits set the gain of the volume control (
Table 33
). When IVOLC bit is “0”, IVL7-0 and IVR7-0 bits
control Lch and Rch volume values independently. When IVOLC bit is “1”, IVL7-0 bits controls both channels. The
IVOL value is changed at zero crossing or timeout. Zero crossing timeout period is set by ZTM1-0 bits. If IVL7-0 or
IVR7-0 bits are written during PMADL=PMADR bits = “0”, IVOL operation starts with the written values at the end of
the ADC initialization cycle after PMADL or PMADR bit is changed to “1”.
IVR7-0 bits
F1H
F0H
EFH
:
92H
(default)
91H
90H
:
03H
02H
01H
00H
Table 33. Input Digital Volume Setting
Side Tone Volume (SVOLA)
The AK4671 has the channel independent side tone volume (5 levels, 6dB step). The volume can be set by the
SVAL/R2-0 bits. The volume is included at mixing path from ALC to 5-band EQ. The output data of ALC is changed
from 0 to –24dB.
SVL2-0
0H
1H
6dB
2H
12dB
3H
18dB
4H
24dB
Others
Table 34. Side Tone Volume A Code Table (N/A: Not available)
IVL7-0 bits
GAIN (dB)
Step
+36.0
+35.625
+35.25
:
+0.375
0.0
0.375
:
53.25
53.625
54
MUTE
0.375dB
Gain
0dB
(default)
N/A
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