AK7735EQ Datasheet, PDF (96/142 Pages) Asahi Kasei Microsystems – Dual DSP with 4chADC + 4chDAC + 4chSRC

[AK7735]
3. Microphone Bias Output
The AK7735 has a line of microphone bias output. The power supply of microphone is supplied from the
MPWR pin by setting PMMB bit = “1”. The output voltage is 2.5V (AVDD=3.3V) and the load resistance is
min. 2kΩ.
PMMB bit
MPWR pin
0
Hi-Z
(default)
1
Output
Table 48. Microphone Bias Output
PMMB bit
MPWR pin
AK7735
4.7k
4.7k
Microphone
4.7k
Microphone
4.7k
INP1
INN1
100nF
INP2
INN2
100nF
MIC-Amp Lch
MIC-Amp Rch
PMMB bit
MPWR pin
AK7735
4.7k
4.7k
Microphone
AIN1L
100nF
MIC-Amp Lch
Microphone
AIN1R
100nF
MIC-Amp Rch
Figure 71. MIC Block Circuit (Differential Input) Figure 72. MIC Block Circuit (Single-end Input)
016014707-E-00
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2016/12