AK4665A Datasheet, PDF (24/52 Pages) Asahi Kasei Microsystems – 20-Bit Stereo CODEC with MIC/HP-AMP

ASAHI KASEI
[AK4665A]
„ Digital Output Volume (DATT)
The AK4665A has a channel-independent digital attenuator (256 levels, 0.5dB step). This digital attenuator is placed
before the D/A converter. ATTL/R7-0 bits set the attenuation level (0dB to −127dB or MUTE) for each channel (DATT).
At DATTC bit = “1”, ATTL7-0 bits control both Lch and Rch attenuation levels. At DATTC bit = “0”, ATTL7-0 bits
control the Lch level and ATTR7-0 bits control the Rch level.
ATTL/R7-0
Attenuation
FFH
0dB
FEH
−0.5dB
FDH
−1.0dB
FCH
−1.5dB
:
:
:
:
02H
−126.5dB
01H
−127.0dB
00H
MUTE (−∞) Default
Table 19. Digital Volume Code Table
The ATS bit sets the transition time between set values of ATTL/R7-0 bits as either 1061/fs or 256/fs (Table 20). When
ATS bit is “0”, a soft transition between the set values occurs (1062 levels). It takes 1061/fs (24ms@fs=44.1kHz) from
“FFH” (0dB) to “00H” (MUTE). When PDN pin is “L”, ATTL/R bits are initialized to “00H”. The ATTL/R bits are
“00H” when PMDAC bit is “0”. When PMDAC bit returns to “1”, the ATTL/R bits fade to their current value.
ATS bit
0
1
Transition time between ATTL/R7-0 bits = 00H and FFH
Setting
fs=8kHz
fs=44.1kHz
1061/fs
133ms
24ms
256/fs
32ms
6ms
Table 20. Transition Time Setting of Digital Output Volume
Default
MS0440-E-01
- 24 -
2006/05