AK4679EG Datasheet, PDF (62/220 Pages) Asahi Kasei Microsystems – 24bit Stereo CODEC with DSP and MIC/RCV/HP/SPK/LINE-AMP

[AK4679]
■ MIC Gain Amplifier
The AK4679 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 (Table 21).
Mode
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
MGNL3 MGNL2 MGNL1 MGNL0
/MGNR3 /MGNR2 /MGNR1 /MGNR0 Input Gain
bits
bits
bits
bits
0
0
0
0
N/A
0
0
0
1
N/A
0
0
1
0
N/A
0
0
1
1
−6dB
0
1
0
0
−3dB
0
1
0
1
0dB
0
1
1
0
+3dB
0
1
1
1
+6dB
1
0
0
0
+9dB
1
0
0
1
+12dB
1
0
1
0
+15dB
1
0
1
1
+18dB
1
1
0
0
+21dB
1
1
0
1
+24dB
1
1
1
0
N/A
1
1
1
1
N/A
Table 21. Mic Input Gain (N/A: Not available)
(default)
MS1402-E-06
- 62 -
2013/02