[AK4679]
■ MIC Power
When PMMP1 bit (PMMP2 bit) = “1”, the MPWR1 pin (MPWR2 pin) supplies power for the microphone. This output
voltage is typically 2.5V @MICL1 bit (MICL2 bit) =“0” (SVDD=3.0 ~ 5.5V), and typically 2.8V@MICL1 bit (MICL2
bit) = “1” (SVDD=3.3 ~ 5.5V) (Table 22). The load resistance is minimum 1kΩ for each MPWR1 pin and MPWR2 pin.
In case of using two sets of stereo mic, the load resistance is minimum 2kΩ for each channel. Any capacitor must not be
connected directly to the MPWR1 pin (MPWR2 pin) (Figure 56).
MICL1 bit
MICL2 bit
Output Level (typ)
AVDD=1.8V
2.5V
SVDD Voltage Range
Output Level (typ)
0
1
3.0 ~ 5.5V
3.3 ~ 5.5V
1.39 x AVDD
1.56 x AVDD
(default)
2.8V
Table 22. MIC Power 1, MC Power 2 Output Level
PMMP1 bit
MPWR1 pin
Hi-Z
0
1
(default)
(default)
Output
Table 23. MIC Power 1 Status
PMMP2 bit
MPWR2 pin
0
1
Hi-Z
Output
Table 24. MIC Power 2 Status
MIC Power 2
MIC Power 1
MPWR2 pin
MPWR1 pin
Microphone
LIN1 pin
RIN1 pin
LIN2 pin
Microphone
Microphone
Microphone
AK4679
RIN2 pin
Figure 56. MIC Block Circuit
MS1402-E-06
2013/02
- 63 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
