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ICS-40720 Datasheet(PDF) 8 Page - List of Unclassifed Manufacturers

Part # ICS-40720
Description  Ultra?륧ow Noise Microphone with Differential Output
PDF  16 Pages
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Manufacturer  ETC2 [List of Unclassifed Manufacturers]
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ICS-40720 Datasheet(HTML) 8 Page - List of Unclassifed Manufacturers

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  ICS‐40720 
Page 8 of 16
 
Document Number: DS‐000045  
Revision: 1.3 
THEORY OF OPERATION 
 
BALANCED OUTPUT 
The ICS‐40720 has a balanced differential output with 700 Ω output impedance. This configuration is compatible with a fully‐
differential codec input and provides the benefits of a balanced signal between the microphone and codec. A balanced analog audio 
signal provides rejection of common‐mode noise that is present on both the positive and negative signals.  
 
 
SINGLE‐ENDED OPERATION 
The ICS‐40720 can be used as a single‐ended microphone by using the signal from only one of the two output pins. In this 
configuration, the sensitivity will be 6 dB lower than the differential output, but with the same high SNR performance. Pin OUTPUT+ 
will output the non‐inverted signal, relative to the acoustic input, while the OUTPUT− pin will output an inverted signal. The unused 
output pin should be left disconnected when the mic is used in single‐ended mode; do not connect the unused pin to ground. 



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