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AK5355 Datasheet(PDF) 11 Page - Asahi Kasei Microsystems

Part # AK5355
Description  LOW POWER 16BIT ADC
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Manufacturer  AKM [Asahi Kasei Microsystems]
Direct Link  http://www.akm.com
Logo AKM - Asahi Kasei Microsystems

AK5355 Datasheet(HTML) 11 Page - Asahi Kasei Microsystems

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ASAHI KASEI
[AK5355]
MS0113-E-00
2001/08
- 11 -
MIC Device Connection Example
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
Ω (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 8, 1
st order LPF by 2.2k
Ω and 10µF is inserted between the 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
Analog Gain
Digital Gain
S/N
+15dB
0dB
83dB
+15dB
+25dB
58dB
+15dB
+35dB
48dB
Table 3. S/N of each gain level
VCOM
1
RIN
2
LIN
3
VSS
4
VA
5
VD
6
SEL
7
NC
8
16
15
14
13
12
11
10
9
TST1
NC
PDN
BCLK
MCLK
LRCK
SDTO
Top View
0.1
µ
Analog Supply
10
µ
+
Controller
System Ground
Analog Ground
DIF
Reset
+
0.1
µ
2.2
µ
Mode
Setting
2.1
∼ 3.6V
0.1
µ
10
µ +
Digital Supply
2.1
∼ 3.6V
MIC
10
µ
+
2.2k
2.2k
0.1
µ
Figure 8. MIC Device Connection Example


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