AK4618 Datasheet, PDF (39/60 Pages) Asahi Kasei Microsystems – 192kHz 24-bit 6ch/12ch Audio CODEC with Microphone Interface

[AK4618]
■ MIC Gain Amplifier
The AK4618 has a gain amplifier which supports both single-ended and differential inputs. When MDIE 6-1bit is set to
“1”, differential inputs are supported by the IN6-1P IN6-1N, pins and the maximum input voltage is dependent on
AVDD1. If the AVDD= 3.3V, the maximum input voltage for single-ended input is 2.67Vpp and ±2.67Vpp for
differential inputs. The typical input impedance is 60k (typ). MGAIN1 2-0, MGAIN2 2-0, MGAIN3 2-0, MGAIN4 2-0,
MGAIN5 2-0, MGAIN6 2-0 bits control the input gain of the microphone amplifier (Table 16). A pop nose may occur if
the input gain is changed during an operation.
Mode
0
1
2
3
4
5
6
7
MGAIN12 MGAIN11 MGAIN10
MGAIN22 MGAIN21 MGAIN20
MGAIN32 MGAIN31 MGAIN30
MGAIN42 MGAIN41 MGAIN40
MGAIN52 MGAIN51 MGAIN50
MGAIN62 MGAIN61 MGAIN60
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Table 16. MIC Input Gain (typ.)
Input Gain
0dB
15dB
18dB
21dB
24dB
27dB
30dB
33dB
(default)
015000617-E-00
- 39 -
2015/01