參數(shù)資料
型號： AK4665AEN
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, QCC32
封裝： 5 X 5 MM, 0.50 MM PITCH, LEAD FREE, QFN-32
文件頁數(shù)： 8/52頁
文件大?。?/td> 522K
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
Input Resistance
0
0dB
60k
(typ)
Default
0
1
6dB
60k
(typ)
1
0
+6dB
30k
(typ)
1
+30dB
30k
(typ)
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
Hi-Z
Default
1
Output
Table 6. MIC Power
MPWR
≥ 2k
MIC Power
Microphone
MICIN
MIC-Amp
Figure 12. MIC Block Circuit
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