AK4632VN AKM [Asahi Kasei Microsystems], AK4632VN Datasheet - Page 31

• Manufacturer Part Number: AK4632VN
• Description: 16-Bit ?? Mono CODEC with ALC & MIC/SPK/Video-AMP
• Manufacturer: AKM [Asahi Kasei Microsystems]

ASAHI KASEI
The ADC has a digital high pass filter for DC offset cancellation. The cut-off frequency of the HPF is 1.25Hz
(@fs=8kHz) and scales with sampling rate (fs).
The AK4632 has a Gain Amplifier for Microphone input. This gain is 0dB, +20dB, +26dB or +32dB, selected by the
MGAIN1-0 bit. The typical input impedance is 30kΩ.
The MPI pin supplies power for the Microphone. This output voltage is typically 0.75 x AVDD and the load resistance is
minimum 2kΩ. No capacitor must not be connected directly to MPI pin. (See Figure 30)
MS0396-E-00
FCK
BICK(32fs)
SDTI(i)
BICK(64fs)
SDTO(o)
SDTI(i)
SDTO(o)
Digital High Pass Filter
MIC Gain Amplifier
MIC Power
0
0
1
1
15
15:MSB, 0:LSB
15
15
15
2
2
14
14
14
14
3
3
13
13
13
13
MGAIN1 bit
4
4
7
MIC Power
0
0
1
1
9
14
MIC-Amp
2
2
7
7
10
15
Data
6
6
1
1
11
16
Figure 30. MIC Block Circuit
MGAIN0 bit
0
0
5
5
Figure 29. Mode 3 Timing
12
17
Table 14. Input Gain
4
4
0
1
0
1
13
18
3
3
Don’t Care
14
MPI pin
MIC pin
- 31 -
2
2
15
31
1
1
0
0
Input Gain
0
0
1/fs
+20dB
+26dB
+32dB
≥ 2k Ω
0dB
1
1
2
2
3
3
Microphone
4
4
Default
9
14
Don’t Care
10
15
11
16
12
17
13
18
14
15
31
[AK4632]
2005/06
0
0
1
1