Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 65 of 93
12.1.2 LINE IN Connection
If the audio source is not a mike but a different device, the following connections can be done.
Place 100nF capacitor in series with both inputs, so the DC current is blocked.
Place the 33pF-100Ohm-33pF RF-filter, in order to prevent some EMI field to get into the high
impedance high gain MIC inputs.
Since the input is differential, the common mode voltage noise between the two (different)
ground is rejected, provided that both MIC+ & MIC- are connected directly onto the source.
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