ak4589 AKM Semiconductor, Inc., ak4589 Datasheet - Page 34

• Manufacturer Part Number: ak4589
• Description: 2/8-channel Audio Codec With Dir
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The AK4589 has channel-independent digital attenuator (128 levels, 0.5dB step). Attenuation level of each channel can
be set by each ATT7-0 bits (Table 15).
Transition time between set values of ATT7-0 bits can be selected by ATS1-0 bits (Table 16). Transition between set
values is the soft transition. Therefore, the switching noise does not occur in the transition.
The transition between set values is soft transition of 1792 levels in mode 0. It takes 1792/fs (37.3ms@fs=48kHz) from
00H(0dB) to 7FH(MUTE) in mode 0. If PDN pin goes to “L”, the ATTs are initialized to 00H. The ATTs are 00H when
RSTN bit = “0”. When RSTN bit return to “1”, the ATTs fade to their current value.
MS0339-E-00
Digital Attenuator
Mode
Table 16. Transition time between set values of ATT7-0 bits
0
1
2
3
Table 15. Attenuation level of digital attenuator
ATT7-0
7DH
7EH
FEH
FFH
00H
01H
02H
7FH
:
ATS1
0
0
1
1
Attenuation Level
MUTE (-∞)
MUTE (-∞)
MUTE (-∞)
ATS0
-62.5dB
- 34 -
-0.5dB
-1.0dB
-63dB
0
1
0
1
0dB
:
:
ATT speed
1792/fs
896/fs
256/fs
256/fs
Default
Default
[AK4589]
2004/09