AK4682 Datasheet, PDF (22/43 Pages) Asahi Kasei Microsystems – Multi-channel CODEC with 2Vrms Stereo Selector

[AK4682]
■ Digital Volume Control
The AK4682 has channel-independent digital volume control (256 levels, 0.5dB step). The IATL7-0, IATR7-0 bits set
the volume level of each ADC channel (Table 16). The OAT1L7-0, OAT1R7-0, OAT2L7-0 and OAT2R7-0 bits set
each DAC channel (Table 17).
IATL7-0,
IATR7-0
00H
01H
02H
:
2FH
30H
31H
FEH
FFH
Attenuation Level
+24dB
+23.5dB
+22.0dB
:
+0.5dB
0dB
-0.5dB
:
-103dB
MUTE (-∞)
(default)
Table 16.ADC Digital Volume (IATT)
OAT1L7-0,
OAT1R7-0,
OAT2L7-0,
OAT2R7-0
00H
01H
02H
:
17H
18H
19H
FEH
FFH
Attenuation Level
+12dB
+11.5dB
+11.0dB
:
+0.5dB
0dB
-0.5dB
:
-115dB
MUTE (-∞)
(default)
Table 17.DAC Digital Volume (OATT)
ATSAD (ATSDA) bits (Table 18, Table 19) control the transition time of attenuation. The transition between each
attenuation level is the soft transition. Therefore, the switching noise does not occur in the transition.
Mode
0
1
ATSAD
0
1
ATT speed
1061/fs
256/fs
(default)
Table 18. Transition time of attenuation (ADC)
Mode
0
1
ATSDA
0
1
ATT speed
1061/fs
256/fs
(default)
Table 19. Transition time of attenuation (DAC)
MS0610-E-01
- 22 -
2007/07