參數(shù)資料
型號(hào)： AK4665AEN
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類： Codec
英文描述： 20-Bit Stereo CODEC with MIC/HP-AMP
中文描述： 20位立體聲編解碼器麥克風(fēng)/惠普腺苷
文件頁(yè)數(shù)： 24/52頁(yè)
文件大?。?/td> 541K
代理商： AK4665AEN
ASAHI KASEI
[AK4665A]
MS0440-E-01
2006/05
- 24 -
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
FEH
0.5dB
FDH
1.0dB
FCH
1.5dB
:
:
02H
126.5dB
01H
127.0dB
00H
MUTE (
∞
)
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.
Transition time between ATTL/R7-0 bits = 00H and FFH
ATS bit
Setting
fs=8kHz
0
1061/fs
133ms
1
256/fs
32ms
Table 20. Transition Time Setting of Digital Output Volume
Default
0dB
:
:
fs=44.1kHz
24ms
6ms
Default
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