AK4601VQ Datasheet, PDF (77/111 Pages) Asahi Kasei Microsystems – Audio HUB CODEC with Digital Mixer

[AK4601]
2. Microphone Input Selector
The AK4601 has microphone input selectors. Each microphone amplifier input is selectable between
single-ended input and differential input by AD1LSEL bit or AD1RSEL bit.
AIN1L / INP1 pin
INN1 pin
AIN1R / INP2 pin
INN2 pin
AD1LSEL bit
AK4601
MIC-Amp Lch
ADC Lch
AD1RSEL bit
MIC-Amp Rch
ADC Rch
Figure 66. Microphone Input Selector
AD1LSEL bit
0
1
ADC Lch
AD1RSEL bit ADC Rch
INP1/INN1 (default)
0
INP2/INN2
AIN1L
1
AIN1R
Table 42. Microphone Input Selector
(default)
3. Microphone Bias Output
The AK4601 has two lines of microphone bias outputs. The power supply of microphones are supplied
from the MPWR1 pin and the MPWR2 pin by setting PMMB1 bit = “1” and PMMB2 bit = “1”, respectively.
The output voltage is 2.5V (AVDD=3.3V) and the load resistance is min. 2kΩ.
PMMB1 bit
0
1
MPWR1 pin
PMMB2bit MPWR2 pin
Hi-Z
(default)
0
Hi-Z
Output
1
Output
Table 43. Microphone Bias Output
(default)
PMB1 bit
MPWR1 pin
AK4601
2k
PMB2 bit
MPWR2 pin
2k
Microphone
INP1
INN1
0.1µF
2k
Microphone
INP2
INN2
2k ^0.1µF
MIC-Amp Lch
MIC-Amp Rch
PMB1 bit
MPWR1 pin
2k
PMB2 bit
MPWR2 pin
2k
Microphone
AIN1L
AK4601
0.1µF
MIC-Amp Lch
Microphone
AIN1R
0.1µF
MIC-Amp Rch
Figure 67. MIC Block Circuit (Differential Input) Figure 68. MIC Block Circuit (Single-end Input)
016000391-E-01
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