參數(shù)資料
型號(hào): AK4671
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: Stereo CODEC with MIC/RCV/HP-AMP
中文描述: 立體聲編解碼器麥克風(fēng)/垃圾車/惠普腺苷
文件頁數(shù): 74/164頁
文件大?。?/td> 1792K
代理商: AK4671
[AK4671]
MS0666-E-00
2007/10
- 74 -
Digital Output Volume
The AK4671 has a digital output volume (256 levels, 0.5dB step, Mute). The volume can be set by the OVL7-0 and
OVR7-0 bits. The volume is included in front of a DAC block. The input data of DAC is changed from +12 to –115dB or
MUTE. When the OVOLC bit = “1”, the OVL7-0 bits control both Lch and Rch attenuation levels. When the OVOLC bit
= “0”, the OVL7-0 bits control Lch level and OVR7-0 bits control Rch level. This volume has a soft transition function.
The OVTM bit sets the transition time between set values of OVL/R7-0 bits as either 1061/fs or 256/fs (
Table 37
). When
OVTM bit = “0”, a soft transition between the set values occurs (1062 levels). It takes 1061/fs (=24ms@fs=44.1kHz)
from 00H (+12dB) to FFH (MUTE).
OVL/R7-0
00H
01H
02H
:
(default)
18H
:
FDH
114.5dB
FEH
115.0dB
FFH
MUTE (
)
Table 36. Digital Volume Code Table
Transition time between DVL/R7-0 bits = 00H and FFH
OVTM bit
Setting
0
1061/fs
1
256/fs
Table 37. Transition Time Setting of Digital Output Volume
Gain
+12.0dB
+11.5dB
+11.0dB
:
0dB
:
Step
0.5dB
fs=8kHz
133ms
32ms
fs=44.1kHz
24ms
6ms
(default)
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