AK4490EQ Datasheet, PDF (57/68 Pages) Asahi Kasei Microsystems – Premium 32-Bit 2ch DAC

[AK4490]
Addr Register Name
03H Lch ATT
04H Rch ATT
R(I2C)/W
Default
D7
ATT7
ATT7
R/W
1
D6
ATT6
ATT6
R/W
1
D5
ATT5
ATT5
R/W
1
D4
ATT4
ATT4
R/W
1
D3
ATT3
ATT3
R/W
1
D2
ATT2
ATT2
R/W
1
D1
ATT1
ATT1
R/W
1
D0
ATT0
ATT0
R/W
1
ATT7-0: Attenuation Level
256 levels, 0.5dB step
Data
FFH
FEH
FDH
:
:
02H
01H
00H
Attenuation
0dB
-0.5dB
-1.0dB
:
:
-126.5dB
-127.0dB
MUTE (-)
The transition between set values is soft transition of 7425 levels. It takes 7424/fs
(168ms@fs=44.1kHz) from FFH (0dB) to 00H (MUTE). If the PDN pin goes to “L”, the ATTs are
initialized to FFH. The ATTs are FFH when RSTN bit= “0”. When RSTN return to “1”, the ATTs fade
to their current value. This digital attenuator is independent of soft mute function.
Addr Register Name
05H Control 4
R(I2C)/W
Default
D7
D6
D5
D4
D3
D2
D1
D0
INVL INVR
0
0
0
0
DFS2 SSLOW
R/W
R/W
R
R
R
R
R/W
R/W
0
0
0
0
0
0
0
0
SSLOW: Super Slow Roll-off Filter Enable
0: Disable (default)
1: Enable
DFS2: Sampling Speed Control (Table 9)
Initial value is “000” (Normal Speed). Click noise occurs when DFS2-0 bits are changed.
(01H, D4, D3: DFS1-0 bits)
DFS2
0
0
0
0
1
1
1
1
DFS1 DFS0
Sampling Rate (fs)
0
0
Normal Speed Mode
30kHz  54kHz
0
1
Double Speed Mode 54kHz  108kHz
1
0
Quad Speed Mode
120kHz  216kHz
1
1
Reserved
-
0
0
Oct Speed Mode
384kHz
0
1
Hex Speed Mode
768kHz
1
0
Reserved
-
1
1
Reserved
-
Table 9. Sampling Speed (Manual Setting Mode @Serial Mode)
(default)
MS1648-E-03
- 57 -
2014/11