參數(shù)資料
型號(hào): AK4642EN
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: Stereo CODEC with MIC/HP/SPK-AMP
中文描述: 立體聲編解碼器麥克風(fēng)/惠普/胰腎聯(lián)合移植腺苷
文件頁(yè)數(shù): 32/83頁(yè)
文件大?。?/td> 670K
代理商: AK4642EN
ASAHI KASEI
[AK4642EN]
MS0420-E-00
2005/09
- 32 -
IN1
pin
IN1+ pin
MPWR pin
AK4642
MIC-Amp
1k
1k
Figure 21. Connection Example for Full-differential Mic Input (MDIF1/2 bits = “1”)
MIC Gain Amplifier
The AK4642 has a gain amplifier for microphone input. The gain of MIC-Amp is selected by the MGAIN1-0 bits (see
Table 16). The typical input impedance is 60k
(typ)@MGAIN1-0 bits = “00” or 30k
(typ)@MGAIN1-0 bits = “01”,
“10” or “11”.
MGAIN1 bit
MGAIN0 bit
0
0
0
1
1
0
1
1
Table 16. 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
. In case of using two sets of stereo mic, the load resistance is minimum 2k
for
each channel. No capacitor must not be connected directly to MPWR pin (see Figure 22).
PMMP bit
MPWR pin
0
1
Table 17. MIC Power
MPWR pin
Input Gain
0dB
+20dB
+26dB
+32dB
Default
Default
Hi-Z
Output
MIC Power
Microphone
LIN1 pin
Microphone
RIN1 pin
Microphone
LIN2 pin
Microphone
RIN2 pin
Figure 22. MIC Block Circuit
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