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ICS-40720 Datasheet(PDF) 9 Page - List of Unclassifed Manufacturers |
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ICS-40720 Datasheet(HTML) 9 Page - List of Unclassifed Manufacturers |
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9 / 16 page ![]() 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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