AK4529 Datasheet, PDF (21/38 Pages) Asahi Kasei Microsystems – High Performance Multi-channel Audio CODEC

ASAHI KASEI
[AK4529]
n Digital Attenuator
AK4529 has channel-independent digital attenuator (256 levels, 0.5dB step). Attenuation level of each channel can be set
by each ATT7-0 bits (table 11).
ATT7-0
00H
01H
02H
:
FDH
FEH
FFH
Attenuation Level
0dB
-0.5dB
-1.0dB
:
-126.5dB
-127.0dB
MUTE (-∞)
Default
Table 11. Attenuation level of digital attenuator
Transition time between set values of ATT7-0 bits can be selected by ATS1-0 bits (table 12).
Mode
0
1
2
ATS1
0
0
1
ATS0
0
1
0
ATT speed
7424/fs
1024/fs
256/fs
Default
Table 12. Transition time between set values of ATT7-0 bits
The transition between set values is soft transition of 7425 levels in mode 0. It takes 7424/fs (168ms@fs=44.1kHz) from
00H(0dB) to FFH(MUTE) in mode 0. If PDN pin goes to “L”, the ATTs are initialized to 00H. The ATTs are 00H when
RSTN = “0”. When RSTN return to “1”, the ATTs fade to their current value. Digital attenuator is independent of soft
mute function.
MS0082-E-00
- 21 -
2001/3