AK4633 Datasheet, PDF (38/82 Pages) Asahi Kasei Microsystems – 16-Bit Mono CODEC with ALC & MIC/SPK-AMP

ASAHI KASEI
[AK4633]
„ MIC Power
The MPI pin supplies power for the Microphone. This output voltage scales with 0.8 x AVDD (typ) and the load
resistance is minimum 2kΩ. Don’t connect the capacitor directly to MPI pin
MPI pin
≥ 2k
MIC pin
MIC-Power
AK4633
MIC-Amp
A/D HPF
Audio
I/F
BICK pin
FCK pin
STDO pin
Figure 30. MIC Block Circuit
„ MIC Differential Input
The MIC input becomes an differential input when MDIF bit is “1”. The input pins are MIC and MICP pins. At this time,
the MICP pin couldn’t be used for an BEEP input. When MDIF bit is “1”, the PMBP, BEEPA and BEEPS bits should be
set to “0”.
MPI pin
1k
MICP pin
MICN pin
1k
MIC-Power
AK4633
MIC-Amp
A/D HPF
Audio
I/F
Figure 31. MIC Differential Input Circuit
BICK pin
FCK pin
STDO pin
MS0447-E-03
- 38 -
2006/04