AK5355VT AKM [Asahi Kasei Microsystems], AK5355VT Datasheet - Page 11

• Manufacturer Part Number: AK5355VT
• Description: LOW POWER 16BIT ADC
• Manufacturer: AKM [Asahi Kasei Microsystems]

ASAHI KASEI
Figure 8 shows the connection example of MIC Device. In this case, a mono microphone is connected to LIN pin the
AK5355. Unused RIN pin can be open. The power supply for the microphone is provided via 4.4k (2.2k + 2.2k ) from
analog power supply. The power supply noise provided to the microphone should be care because the microphone gain is
usually high, around 40dB. In Figure 8, 1
microphone.
The AK5355 has a gain of +15dB in analog stage. However, as the usual application needs a gain of around 40dB or 50dB,
the shortage of gain, 25dB or 35dB, should be covered by digital processing like DSP.
The total S/N in each gain level is shown in Table 3
MS0113-E-00
Analog Supply
Digital Supply
MIC Device Connection Example
2.1
2.1
3.6V
3.6V
MIC
2.2k
2.2k
10
10
Analog Gain
0.1
10
+15dB
+15dB
+15dB
+
+
Figure 8. MIC Device Connection Example
+
0.1
st
order LPF by 2.2k and 10 F is inserted between the power supply and the
Table 3. S/N of each gain level
0.1
1
2
3
4
5
6
7
8
Digital Gain
2.2
VCOM
RIN
LIN
VSS
VA
VD
SEL
NC
+25dB
+35dB
0dB
- 11 -
+
Analog Ground
Top View
0.1
MCLK
SDTO
LRCK
BCLK
TST1
83dB
58dB
48dB
PDN
S/N
DIF
NC
16
15
14
13
12
11
10
9
Reset
System Ground
Mode
Setting
Controller
[AK5355]
2001/08