參數(shù)資料
型號: AK4628VQ
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: HIGH PERFORMANCE MULTI CHANNEL AUDIO CODEC
中文描述: 高性能多通道音頻解碼器
文件頁數(shù): 24/41頁
文件大小: 546K
代理商: AK4628VQ
ASAHI KASEI
[AK4628]
MS0211-E-02
2004/03
- 24 -
Digital Attenuator
AK4628 has channel-independent digital attenuator (128 levels, 0.5dB step). Attenuation level of each channel can be set
by each ATT7-0 bits (Table 13).
ATT7-0
Attenuation Level
00H
0dB
01H
-0.5dB
02H
-1.0dB
:
7DH
-62.5dB
7EH
-63dB
7FH
MUTE (-
)
FEH
MUTE (-
)
FFH
MUTE (-
)
Table 13. Attenuation level of digital attenuator
Transition time between set values of ATT7-0 bits can be selected by ATS1-0 bits (Table 14). Transition between set
values is the soft transition. Therefore, the switching noise does not occur in the transition.
Mode
ATS1
ATS0
0
0
0
1
0
1
2
1
0
3
1
1
Table 14. Transition time between set values of ATT7-0 bits
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 = “0”. When RSTN return to “1”, the ATTs fade to their current value.
:
:
Default
ATT speed
1792/fs
896/fs
256/fs
256/fs
Default
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