參數(shù)資料
型號: AK4371VN
廠商: Asahi Kasei Microsystems Co.,Ltd
英文描述: DAC with built-in PLL & HP-AMP
中文描述: DAC,帶有內(nèi)置的鎖相環(huán)
文件頁數(shù): 28/62頁
文件大小: 842K
代理商: AK4371VN
[AK4371]
MS0596-E-00
2007/04
- 28 -
Digital Attenuator
The AK4371 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 (Table 17). At
DATTC bit = “1”, ATTL7-0 bits control both channel’s attenuation levels. At DATTC bit = “0”, ATTL7-0 bits control
the left channel level and ATTR7-0 bits control the right channel level.
ATTL7-0
ATTR7-0
FFH
FEH
0.5dB
FDH
1.0dB
FCH
1.5dB
:
:
02H
126.5dB
01H
127.0dB
00H
MUTE (
)
Table 17. Digital Volume ATT values
The ATS bit sets the transition time between set values of ATT7-0 bits as either 1061/fs or 7424/fs (Table 18). When the
ATS bit = “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). The ATTs are 00H when the PMDAC bit is “0”. When the PMDAC returns to “1”, the ATTs
fade to their current value. The digital attenuator is independent of the soft mute function.
ATT speed
ATS
0dB to MUTE
0
1061/fs
1
7424/fs
Table 18. Transition time between set values of ATT7-0 bits
Attenuation
0dB
(default)
:
:
1 step
4/fs
29/fs
(default)
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