AK4566 Datasheet, PDF (37/45 Pages) Asahi Kasei Microsystems – 20bit Stereo CODEC with built-in IPGA & HP-AMP

ASAHI KASEI
AKM CONFIDENTIAL
[AK4566]
Addr
0AH
0BH
Register Name
DAC Lch ATT
DAC Rch ATT
Default
D7
ATTL7
ATTR7
0
D6
ATTL6
ATTR6
0
D5
ATTL5
ATTR5
0
D4
ATTL4
ATTR4
0
D3
ATTL3
ATTR3
0
D2
ATTL2
ATTR2
0
D1
ATTL1
ATTR1
0
D0
ATTL0
ATTR0
0
ATTL7-0: Setting of the attenuation value of output signal from DACL
ATTR7-0: Setting of the attenuation value of output signal from DACR
The AK4566 has channel-independent digital attenuator (256 levels, 0.5dB step). This digital attenuator is
placed before D/A converter. ATTL/R7-0 bits set the attenuation level (0dB to -127dB or MUTE) of each
channel. Digital attenuator is independent of soft mute function.
ATTL/R7-0
Attenuation
FFH
0dB
FEH
FDH
FCH
−0.5dB
−1.0dB
−1.5dB
:
:
:
:
02H
−126.5dB
01H
−127.0dB
00H
MUTE (−∞) Default
Table 19. Digital Volume ATT values
Addr Register Name
0CH MOUT ATT
Default
D7
D6
D5
D4
D3
D2
D1
D0
0
0
0
MMUTE ATTM3 ATTM2 ATTM1 ATTM0
0
0
0
1
0
0
0
0
ATTM3-0: Analog volume control for MOUT
MMUTE: Mute control for MOUT
0: Normal operation. Attenuation value is controlled by ATTM3-0 bits.
1: Mute. ATTM3-0 bits are ignored. (Default)
MMUTE
ATTM3-0
Attenuation
0FH
0dB
0EH
−2dB
0DH
−4dB
0
0CH
−6dB
:
:
:
:
01H
−28dB
00H
−30dB
1
x
MUTE
Table 20. MOUT Volume ATT values
Default
REV 0.5
- 37 -
2002/2