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參數(shù)資料
| 型號： | AK4641VN |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | 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 |
| 文件頁數(shù)： | 16/51頁 |
| 文件大小： | 461K |
| 代理商： | AK4641VN |
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ASAHI KASEI
[AK4641]
MS0301-E-00
2004/05
- 23 -
MIC Gain Amplifier
The AK4641 has a Gain Amplifier for Microphone input. This gain is 0dB or +20dB, selected by the MGAIN bit. The
typical input impedance is 30k
.
MGAIN bit
Input Gain
0
0dB
1
+20dB
Default
Table 9. Input Gain
MIC Power
The MPI and MPE pins supply power for the Microphone. These output voltages are 0.75 x AVDD (typ) and the load
resistance is 2k
(min). No capacitor must be connected directly to MPI and MPE pins. MPWRI/MPWRE bit can control
output from MPI and MPE pin.
INT
EXT
MPI
MPE
DTMIC bit
MDT
0.075 x AVDD
MPWRE bit
MPWRI bit
500k
G
M
R
L
Headset
G
R
L
Headphone
or
AK4641
Figure 22. Microphone Power Supply and Mic Detection
MIC Detection Function
The AK4641 includes the detection function of microphone. The external circuit is showed in Figure 22.
The followings show the example of external microphone detection sequence:
(1) MPWRE bit = “1”.
(2) MPE drives external microphone.
(3) DTMIC bit is set as Table 10. In case of Headset, the input voltage of MDT pin is higher than 0.078 x AVDD because
of the relationship between the bias resistance at MPE pin (typ. 2.2k
) and the microphone impedance. In case of
Headphone, the input voltage of MDT pin is 0V because the pin of headphone jack connected to MDT pin is assigned
as ground.
Input Level of DTM
DTMIC
Result
≥ 0.078 x AVDD
1
Mic (Headset)
< 0.050 x AVDD
0
No Mic (Headphone)
Table 10. Microphone Detection Result
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AK4642 | 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit ???￡ Stereo CODEC with MIC/HP/SPK-AMP |
| AK4642EN | 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP/SPK-AMP |
| AK4642VN | 制造商:AKM 制造商全稱:AKM 功能描述:16-Bit ???￡ Stereo CODEC with MIC/HP/SPK-AMP |
| AK4643 | 制造商:AKM 制造商全稱: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:AKM 功能描述:Stereo CODEC with MIC/HP/RCV/SPK-AMP |
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