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AS3418 Folha de dados(PDF) 14 Page - ams AG

Nome de Peças AS3418
Descrição Electrónicos  Low Noise ANC Solution
PDF  77 Pages
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Fabricante Electrônico  AMSCO [ams AG]
Página de início  http://www.ams.com
Logo AMSCO - ams AG

AS3418 Folha de dados(HTML) 14 Page - ams AG

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AS3418
Functional Description
Datasheet
• PUBLIC
DS000507
• v4-00 • 2020-Jan-23
77
│ 14
6.2.1
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 10 with all necessary components.
Figure 10:
Microphone Capacitor Selection Circuit
The corner frequency of this high pass filter is defined with the capacitor CAC and the gain of the
headphone amplifier. Figure 11 shows an overview of typical cut-off frequencies with different
microphone gain settings.
Figure 11:
Microphone Cut-Off Frequency Overview
Microphone Gain
R1
R2
fcut-off
0dB
22.2k
Ω
0
Ω
1.7Hz
3dB
15716Ω
6484Ω
1.9Hz
6dB
11126Ω
11074Ω
2.2Hz
9dB
7877Ω
14323Ω
2.7Hz
12dB
5576Ω
16623Ω
3.5Hz
15dB
3948Ω
18252Ω
4.5Hz
MUTE
MUTE
AGC
AGC
MICL
MICR
MICACL
MICACR
QMICL
QMICR
CMIC
CMIC
RBIAS
RBIAS
RMICIN
RMICIN
CAC
CAC
MICS
MICS
ANC Microphone
ANC Microphone
DISCHARGE
DISCHARGE
R2
R1
R2
R1



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