參數(shù)資料
型號: AK4683
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: Asynchronous Multi-Channel Audio CODEC with DIR/T
中文描述: 異步多聲道音頻編解碼器署長/噸
文件頁數(shù): 37/82頁
文件大?。?/td> 1257K
代理商: AK4683
ASAHI KASEI
[AK4683]
MS0427-E-01
2005/11
- 37 -
Digital Volume Control
The AK4683 has channel-independent digital volume control (256 levels, 0.5dB step). The ATTAD7-0 bit set the
volume level of each ADC channel (Table 35), ATTDA7-0 set each DAC channel (Table 36).
ATTAD7-0
Attenuation Level
00H
+24dB
01H
+23.5dB
02H
+22.0dB
:
2FH
+0.5dB
30H
0dB
31H
-0.5dB
FEH
-103dB
FFH
MUTE (-
)
Table 35.ADC Digital Volume
ATTDA7-0
Attenuation Level
00H
+12dB
01H
+11.5dB
02H
+11.0dB
:
17H
+0.5dB
18H
0dB
19H
-0.5dB
FEH
-115dB
FFH
MUTE (-
)
Table 36.DAC Digital Volume
Transition time between set values of ATTAD7-0 (ATTDA7-0) bits can be selected by ATSAD (ATSDA) bits (Table
37, Table 38). Transition between set values is the soft transition. Therefore, the switching noise does not occur in the
transition.
Mode
ATSAD
0
0
1
1
Table 37. Transition time between set values of ATTAD7-0 bits (ADC)
Mode
ATSDA
0
0
1
1
Table 38. Transition time between set values of ATTDA7-0 bits (DAC)
The transition between set values is soft transition of 1061 levels in mode 0. It takes 1061/fs (24ms@fs=48kHz) from
00H to FFH(MUTE) in mode 0. If PDN pin goes to “L”, the ATTAD7-0(ATTDA7-0) bits are initialized to 30H(18H).
The ATTs goes to their default value when RSTN bit = “0”. When RSTN1 bit return to “1”, the ATTs fade to their
current value.
:
:
(default)
:
:
(default)
ATT speed
1061/fs
256/fs
(default)
ATT speed
1061/fs
256/fs
(default)
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