User's Manual

PCS3_HD_v01.000-03
Confidential / Preliminary
Page 43 of 101
2013-10-21
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PCS3 Hardware Interface Description
3.8 Analog Audio Interface
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The following figures show possible microphone and line connections.
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470
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VMIC
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2k2
2k2
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5k6
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+
10µF
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1µF
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1µF
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MICP
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MICN
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Module
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AGND
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Figure 12: Single ended microphone connection
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The configuration shown in Figure 12 is suitable for short distances between microphone and
module. A typical electric microphone has a metal case connected to its ground pad. Since this
is routed directly to AGND, electro static discharges applied to the microphone will be easily
led away. It is recommended to use an additional RC-filter for VMIC (for example 470 Ohm and
10µF as shown in the figure) in case a high microphone gain is necessary.
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If the microphone lines are longer, use the configuration shown in Figure 13. It is recommended
to use an additional RC-filter for VMIC (for example 1kOhm, 10µF and 1kOhm as shown in the
figure) in case a high microphone gain is necessary.
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1k
VMIC
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1k
1µF
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MICP
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+
10µF
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MICN
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Module
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1µF
1k
1k
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AGND
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Figure 13: Differential microphone connection