ak4683 AKM Semiconductor, Inc., ak4683 Datasheet - Page 38

• Manufacturer Part Number: ak4683
• Description: Asynchronous Multi-channel Audio Codec With Dir/t
• Manufacturer: AKM Semiconductor, Inc.

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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).
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.
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.
MS0427-E-02
Digital Volume Control
Table 37. Transition time between set values of ATTAD7-0 bits (ADC)
Table 38. Transition time between set values of ATTDA7-0 bits (DAC)
Mode
Mode
ATTAD7-0
ATTDA7-0
0
1
0
1
FEH
FEH
2FH
FFH
FFH
00H
01H
02H
30H
31H
00H
01H
02H
17H
18H
19H
:
:
Table 35.ADC Digital Volume
Table 36.DAC Digital Volume
ATSAD
ATSDA
0
1
0
1
Attenuation Level
Attenuation Level
MUTE (-∞)
MUTE (-∞)
- 38 -
+23.5dB
+22.0dB
+11.5dB
+11.0dB
+0.5dB
-103dB
+0.5dB
-115dB
+24dB
-0.5dB
+12dB
-0.5dB
0dB
0dB
:
:
:
:
ATT speed
ATT speed
1061/fs
1061/fs
256/fs
256/fs
(default)
(default)
(default)
(default)
[AK4683]
2007/04