參數(shù)資料
型號(hào): AK4647
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: Stereo CODEC with MIC/HP-AMP
中文描述: 立體聲編解碼器麥克風(fēng)/惠普腺苷
文件頁(yè)數(shù): 29/72頁(yè)
文件大小: 565K
代理商: AK4647
ASAHI KASEI
[AK4647]
MS0566-E-00
2006/11
- 29 -
MIC Gain Amplifier
The AK4647 has a gain amplifier for microphone input. The gain of MIC-Amp is selected by the MGAIN1-0 bits (see
Table 18). The typical input impedance is 60k
Ω
(typ)@MGAIN1-0 bits = “00” or 30k
Ω
(typ)@MGAIN1-0 bits = “01”,
“10” or “11”.
MGAIN1 bit
MGAIN0 bit
0
0
0
1
1
0
1
1
Table 18. Mic Input Gain
MIC Power
When PMMP bit = “1”, the MPWR pin supplies power for the microphone. This output voltage is typically 0.75 x AVDD
and the load resistance is minimum 0.5k
Ω
. In case of using two sets of stereo mic, the load resistance is minimum 2k
Ω
for
each channel. No capacitor must not be connected directly to MPWR pin (see Figure 23).
PMMP bit
MPWR pin
0
1
Table 19. MIC Power
MPWR pin
Input Gain
0dB
+20dB
+26dB
+32dB
Default
Default
Hi-Z
Output
Ω
MIC Power
Microphone
LIN1 pin
Microphone
RIN1 pin
Microphone
LIN2 pin
Microphone
RIN2 pin
Ω
Ω
Ω
Figure 23. MIC Block Circuit
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AK4647VN 制造商:AKM 制造商全稱:AKM 功能描述:Stereo CODEC with MIC/HP-AMP
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AK4649 制造商:AKM 制造商全稱:AKM 功能描述:24bit Stereo CODEC with MIC/SPK-AMP