ak5700 AKM Semiconductor, Inc., ak5700 Datasheet - Page 33

• Manufacturer Part Number: ak5700
• Description: 16-bit ?? Mono Adc With Pll & Mic-amp
• Manufacturer: AKM Semiconductor, Inc.

ASAHI KASEI
The AK5700 has a gain amplifier for microphone input. The gain of MIC-Amp is selected by the MGAIN1-0 bits (see
Table 20). The typical input impedance is 60kΩ(typ)@MGAIN1-0 bits = “00” or 30kΩ(typ)@MGAIN1-0 bits = “01” or
“10”.
When PMMP bit = “1”, the MPWR pin supplies power for the microphone. This output voltage is typically 0.75 x AVDD
and the load resistance is minimum 1.0kΩ. In case of using two sets of mono mic, the load resistance is minimum 2.0kΩ
for each channel. No capacitor must not be connected directly to MPWR pin (see Figure 34).
MS0569-E-01
MIC Gain Amplifier
MIC Power
Figure 33. Connection Example for Full-differential Mic Input (MDIF1bit = “1”)
MIC Power
MGAIN1 bit
0
0
1
1
PMMP bit
0
1
1k
1k
Figure 34. MIC Block Circuit
MGAIN0 bit
MPWR pin
Table 20. Mic Input Gain
AIN+ pin
AIN− pin
Table 21. MIC Power
MPWR pin
AIN1 pin
AIN2 pin
0
1
0
1
- 33 -
MPWR pin
Output
Hi-Z
Input Gain
+15dB
+30dB
0dB
N/A
MIC-Amp
Default
AK5700
Default
Microphone
Microphone
[AK5700]
2006/12