參數(shù)資料
型號: AK4665AEN
廠商: Asahi Kasei Microsystems Co.,Ltd
元件分類: Codec
英文描述: 20-Bit Stereo CODEC with MIC/HP-AMP
中文描述: 20位立體聲編解碼器麥克風(fēng)/惠普腺苷
文件頁數(shù): 16/52頁
文件大?。?/td> 541K
代理商: AK4665AEN
ASAHI KASEI
[AK4665A]
MS0440-E-01
2006/05
- 16 -
Digital High Pass Filter
The AK4665A has a Digital High Pass Filter (HPF) to cancel DC-offsets in ADC. The cut-off frequency of the HPF is
3.4Hz at fs=44.1kHz. This filter scales with the sampling frequency (fs).
Mono-MIC Gain Amplifier (MICIN pin)
The AK4665A has a gain amplifier for mono-mic input. The gain of Mic-Amp is selected by MGAIN1-0 bits (see Table
5). The input impedance is 60k
(typ) at MGAIN1-0 bits = “00”, “01” and 30k
(typ) at MGAIN1-0 bits = “10”, “11”.
MGAIN1 bit
MGAIN0 bit
Input Gain
0
0
0dB
0
1
6dB
1
0
+6dB
1
1
+30dB
Table 5. MIC Input Gain
MIC Power (MPWR pin)
When PMMP bit is “1”, MPWR pin supplies power for the microphone. This output voltage is 2.0V(typ), and the load
resistance is minimum 2k
. Capacitor must not be connected directly to MPWR pin (see Figure 12).
PMMP bit
MPWR pin
0
1
Table 6. MIC Power
MPWR
Input Resistance
60k
(typ)
60k
(typ)
30k
(typ)
30k
(typ)
Default
Default
Hi-Z
Output
2k
MIC Power
Microphone
MICIN
MIC-Amp
Figure 12. MIC Block Circuit
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