AK4642VN Datasheet, PDF (32/82 Pages) Asahi Kasei Microsystems – 16-Bit ΔΣ Stereo CODEC with MIC/HP/SPK-AMP

ASAHI KASEI
[AK4642]
MPWR pin
1k
IN1− pin
IN1+ pin
1k
AK4642
MIC-Amp
Figure 21. ࠩಈϚΠΫೖྗͷճ࿏ྫ(MDIF1/2 bits = “1”)
„ ϚΠΫ༻ήΠϯΞϯϓ
AK4642͸ϚΠΫ༻ήΠϯΞϯϓΛ಺ଂ͍ͯ͠·͢ɻMGAIN1-0 bitʹΑΓήΠϯΛઃఆ͢Δ͜ͱ͕Ͱ͖·͢
(Table 16)ɻೖྗΠϯϐʔμϯε͸MGAIN1-0 bits = “00”ͷͱ͖typ. 60kΩɺMGAIN1-0 bits = “01”, “10”, “11”ͷ
ͱ͖typ. 30kΩͰ͢ɻ
„ ϚΠΫύϫʔ
MGAIN1 bit MGAIN0 bit Input Gain
0
0
0dB
0
1
+20dB
1
0
+26dB
1
1
+32dB
Table 16. ϚΠΫೖྗήΠϯ
Default
PMMP bit = “1”ͷͱ͖ɺMPWR pin͔ΒϚΠΫ༻ͷిݯΛ͢څڙΔ͜ͱ͕Ͱ͖·͢ɻग़ྗిѹ͸(0.75 x
AVDD)V (typ)ʹൺྫ͠ɺෛՙ఍߅͸ɺmin. 0.5kΩͰ͢ɻεςϨΦϚΠΫ2ܥ౷ͷ৔߹͸֤νϟωϧ min. 2kΩ
Ͱ͢ɻMPWR pinʹίϯσϯα͸઀ଓ͠ͳ͍ͰԼ͍͞ɻ(Figure 22ࢀর)
PMMP bit
MPWR pin
0
Hi-Z
1
Output
Table 17. ϚΠΫύϫʔ
Default
MIC Power
MPWR pin
MS0358-J-02
LIN1 pin
RIN1 pin
LIN2 pin
RIN2 pin
Figure 22. MIC Block Circuit
Microphone
Microphone
Microphone
Microphone
- 32 -
2005/04