AK5355VT AKM [Asahi Kasei Microsystems], AK5355VT Datasheet - Page 14

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

ASAHI KASEI
Figure 9 and Figure 10 show 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 4.4kΩ (2.2kΩ
+ 2.2kΩ) 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 9, 1
power supply and the 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-01
Analog Supply
Digital Supply
MIC Device Connection Example
2.1 ∼ 3.6V
2.1 ∼ 3.6V
MIC
2.2k
2.2k
10µ
10µ
Figure 9. MIC Device Connection Example (AK5355VT)
Analog Gain
0.1µ
10µ
+15dB
+15dB
+15dB
+
+
+
0.1µ
Table 3. S/N of each gain level
0.1µ
1
2
3
4
5
6
7
8
Digital Gain
2.2µ
VCOM
RIN
LIN
VSS
VA
VD
SEL
NC
+25dB
+35dB
0dB
- 14 -
+
Analog Ground
st
Top View
order LPF by 2.2kΩ and 10µF is inserted between the
0.1µ
MCLK
SDTO
LRCK
BCLK
TST1
83dB
58dB
48dB
PDN
S/N
DIF
NC
16
15
14
13
12
11
10
9
System Ground
Reset
Mode
Setting
Controller
[AK5355]
2005/01