參數(shù)資料
型號(hào)： AK4683_07
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(zhǎng)/噸
文件頁數(shù)： 38/84頁
文件大?。?/td> 1077K
代理商： AK4683_07
[AK4683]
MS0427-E-02
2007/04
- 38 -
■
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 of Mode 0 and Mode 1is 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 RSTN1 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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