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[AK4675]
MS0963-E-00
2008/05
- 67 -
ミ
MIC Gain Amplifier
The AK4675 has a gain amplifier for microphone input. The gain of MIC-Amp Lch and Rch is independently selected by
the MGNL3-0 and MGNR3-0 bits (
). The typical input impedance is 42k
Ω
(typ)@MGNL/R0 bits = “0” or
30k
Ω
(typ)@MGNL/R0 bits = “1”.
Mode
MGNL3
MGNR3
MGNL2
MGNR2
MGNL1
MGNR1
MGNL0
MGNR0
Input Gain
Input Resistance
0 0 0 0 0 N/A N/A
1 0 0 0 1
−
12dB 30k
Ω
2 0 0 1 0
−
9dB 42k
Ω
3 0 0 1 1
−
6dB 30k
Ω
4 0 1 0 0
−
3dB 42k
Ω
5 0 1 0 1 0dB 30k
Ω
(default)
6 0 1 1 0 +3dB 42k
Ω
7 0 1 1 1 +6dB 30k
Ω
8 1 0 0 0 +9dB 42k
Ω
9 1 0 0 1
+12dB 30k
Ω
10
1 0 1 0
+15dB 42k
Ω
11
1 0 1 1
+18dB 30k
Ω
12
1 1 0 0
+21dB 42k
Ω
13
1 1 0 1
+24dB 30k
Ω
14
1 1 1 0
+27dB 42k
Ω
15
1 1 1 1
+30dB 30k
Ω
Table 19. Mic Input Gain