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ICS-40720 데이터시트(PDF) 9 Page - List of Unclassifed Manufacturers

부품명 ICS-40720
상세설명  Ultra?륧ow Noise Microphone with Differential Output
PDF  16 Pages
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제조업체  ETC2 [List of Unclassifed Manufacturers]
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ICS-40720 데이터시트(HTML) 9 Page - List of Unclassifed Manufacturers

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  ICS‐40720 
Page 9 of 16
 
Document Number: DS‐000045  
Revision: 1.3 
APPLICATIONS INFORMATION 
 
CODEC CONNECTION 
The ICS‐40720 output can be connected to a dedicated codec microphone input (see Figure 9) or to a high input impedance gain 
stage. A 0.1 µF ceramic capacitor placed close to the ICS‐40720 supply pin is used for testing and is recommended to adequately 
decouple the microphone from noise on the power supply. DC blocking capacitors are required at the outputs of the microphone. 
These capacitors create a high‐pass filter with a corner frequency at  
fC = 1/(2π × C × R)
where R is the input impedance of the codec.  
A minimum value of 2.2 μF is recommended in Figure 9 because the input impedance of some codecs can be as low as 2 kΩ at their 
highest PGA gain setting, which results in a high‐pass filter corner frequency at 37 Hz.  
 
Figure 9. ICS‐40720 Connected to a Differential‐Input Codec 
 
CODEC
ICS-40720
GND
OUTPUT+
IN+
IN−
MICBIAS
2.2µF
MINIMUM
0.1µF
VDD
OUTPUT−



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