參數(shù)資料
型號: AK4648EC
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/惠普/胰腎聯(lián)合移植腺苷
文件頁數(shù): 46/119頁
文件大?。?/td> 1272K
代理商: AK4648EC
[AK4648]
MS0625-E-01
2007/06
- 46 -
MIC Gain Amplifier
The AK4648 has a gain amplifier for microphone input. The gain of MIC-Amp is selected by the MGAIN1-0 bits (Table
22). 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 22. 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. Capacitor must not be connected directly to MPWR pin (Figure 33).
PMMP bit
MPWR pin
0
1
Output
Table 23. MIC Power
MPWR pin
Input Gain
0dB
+20dB
+26dB
+32dB
(default)
(default)
Hi-Z
Ω
MIC Power
Microphone
LIN1 pin
Microphone
RIN1 pin
Microphone
LIN2 pin
Microphone
RIN2 pin
Ω
Ω
Ω
Figure 33. MIC Block Circuit
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