AK4695 Datasheet, PDF (27/107 Pages) Asahi Kasei Microsystems – 24bit 4ch CODEC with MIC/HP/SPK/LINE-AMP

[AK4695]
■ MIC Gain Amplifier
The AK4695 has a gain amplifier for microphone input. The gain of MIC0, MIC1, MIC2 and MIC3 is selected by
M0GN2-0, M1GN2-0, M2GN2-0, M3GN2-0 bits, respectively (Table 14). When the microphone amplifier gain is
changed, MZCN bit must be set to “1” (default = “0”).
M0GN3 bit
M1GN3 bit
M2GN3 bit
M3GN3 bit
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
M0GN2 bit M0GN1 bit M0GN0 bit
M1GN2 bit M1GN1 bit M1GN0 bit
M2GN2 bit M2GN1 bit M2GN0 bit
M3GN2 bit M3GN1 bit M3GN0 bit
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
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 14. MIC Gain Amplifier
Input Gain
+3dB
+4.5dB
+6dB
+7.5dB
+9dB
+10.5dB
+12dB
+13.5dB
+15dB
+16.5dB
+18dB
+19.5dB
+21dB
+24dB
+27dB
+30dB
(default)
■ Low-power Consumption Mode
Set ADPSM bit = “1” and power up ADC, MIC-Amp and MIC-Power for low-power consumption operation mode of
these blocks.
ADPSM
bit
0
1
Mode
4ch ADC Power Consumption
(MIC-Power + MIC-Amp + ADC)
S/N S/(N+D)
(MGAIN=+12dB)
High Performance Mode
44.9mW
103dB
93dB
Low-power Consumption
Operation Mode
33.1mW
102dB
Table 15. ADC Low Power Consumption Operation Mode
> 83dB
(default)
MS1463-E-01
- 27 -
2014/12