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AS3415 Fiches technique(PDF) 21 Page - ams AG

No de pièce AS3415
Description  Integrated Active Noise Cancelling Solution with Bypass Feature
PDF  102 Pages
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Fabricant  AMSCO [ams AG]
Site Internet  http://www.ams.com
Logo AMSCO - ams AG

AS3415 Fiches technique(HTML) 21 Page - ams AG

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ams Datasheet, Confidential: 2014-Jun-13 [v1-30]
AS3415/AS3435 – 21
Detaile d Desc rip t ion
Input Capacitor Selection
The microphone preamplifier needs a bias resistor (RBias) per
channel as well as DC blocking capacitors (CMIC). The capacitors
CAC are DC blocking capacitors to avoid DC amplification of the
non-inverting microphone preamplifier. This capacitor has an
influence on the frequency response because the internal
feedback resistors create a high pass filter. The typical
application circuit is shown in Figure 20 with all necessary
components.
Figure 20:
Microphone Capacitor Selection Circuit
Microphone Capacitor Selection Circuit: This diagram shows a typical microphone application circuit with all
necessary components to operate the amplifier.
The corner frequency of this high pass filter is defined with the
capacitor CAC and the gain of the headphone amplifier.
Figure 21 shows an overview of typical cut-off frequencies with
different microphone gain settings.



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