參數(shù)資料
型號(hào)： AK4641VN
廠商： Asahi Kasei Microsystems Co.,Ltd
元件分類(lèi)： Codec
英文描述： 16 BIT CODEC WITH BLUETOOTH INTERFACE
中文描述： 16位編解碼器與藍(lán)牙接口
文件頁(yè)數(shù)： 20/51頁(yè)
文件大小： 461K
代理商： AK4641VN
ASAHI KASEI
[AK4641]
MS0301-E-00
2004/05
- 27 -
DAC of Stereo CODEC
Mono Mixer
Stereo Mixer
DAC of Stereo
CODEC
DATT
DACM bit
SMUTE
5 Band
Equalizer
DEM
DACL bit
Figure 25. DAC block diagram of Stereo CODEC
The AK4641 has the following functions for DAC of Stereo CODEC.
(1) 5 Band Equalizer
(2) Soft mute
(3) Digital Attenuator
(4) De-emphasis Filter (32kHz, 44.1kHz and 48kHz)
De-emphasis Filter
The AK4641 includes the digital de-emphasis filter (tc = 50/15
s) by IIR filter. Setting the DEM1-0 bits enables the
de-emphasis filter.
DEM1
DEM0
Mode
0
44.1kHz
0
1
OFF
Default
1
0
48kHz
1
32kHz
Table 12. De-emphasis Control
Digital Attenuator
The AK4641 has a channel-independent digital attenuator (256levels, 0.5dB step, Mute). The ATTL/R7-0 bits set the
attenuation level of each channel (Table 13). When the DATTC bit = “1”, the ATTL7-0 bits control both Lch and Rch
attenuation levels. When the DATTC bit = “0”, the ATTL7-0 bits control Lch level and ATTR7-0 bits control Rch level.
This attenuator has a soft transition function. It takes around 1061/fs (24ms@44.1kHz) at TM bit = “0” and 256/fs
(5.8ms@44.1kHz) at TM bit = “1” from 00H to FFH.
ATTL/R7-0
Attenuation
00H
0dB
Default
01H
0.5dB
02H
1.0dB
03H
1.5dB
:
FDH
126.5dB
FEH
127.0dB
FFH
MUTE (
∞)
Table 13. DATT Code Table
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AK4642 制造商:AKM 制造商全稱(chēng):AKM 功能描述:16-Bit ???￡ Stereo CODEC with MIC/HP/SPK-AMP
AK4642EN 制造商:AKM 制造商全稱(chēng):AKM 功能描述:Stereo CODEC with MIC/HP/SPK-AMP
AK4642VN 制造商:AKM 制造商全稱(chēng):AKM 功能描述:16-Bit ???￡ Stereo CODEC with MIC/HP/SPK-AMP
AK4643 制造商:AKM 制造商全稱(chēng):AKM 功能描述:Stereo CODEC with built-in MIC/HP/RCV/SPK amplifier
AK4643EN 制造商:AKM 制造商全稱(chēng):AKM 功能描述:Stereo CODEC with MIC/HP/RCV/SPK-AMP
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