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Wavecom WMOi3 User Manual - page 34
January 2001/ version 1.4
WMOi3 Integrated Modem
confidential ©
34/61
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged
without prior written agreement. Ce document est la propriété exlcusive de WAVECOM. Il ne peut
être communiqué ou divulgué à des tiers sans son autorisation préalable.
4 . 1 . 1 0 . 2
4 . 1 . 1 0 . 2 Microphone
Microphone 1 Inputs
1 Inputs
The MIC1 inputs are differential and do not include internal bias. To use these
inputs with an electret microphone, bias has to be generated outside the WMOI3
modem according to the characteristic of this electret microphone. These inputs
are the standard ones used for an external headset or a handsfree kit. When using
a single-ended connection, be sure to have a very good ground plane, a very good
filtering as well as shielding in order to avoid any disturbance on the audio path.
The gain of MIC1 inputs is internally adjusted. The gain can be tuned from 30dB to
51dB.
The gain can be tuned using the AT+VGR command.
Differential connection
figure 11 : microphone 1 input
R1 = R4 = from 100 to 330
Ω
R2 = R3 = usually between 1K
Ω
and 3.3K
Ω
as per the
microphone characteristics
C1 = 22pF to 100pF
C2 = 47µF
R1 and R4 are used as a voltage supply filter with C2.
C1 has to be the nearest possible to the microphone. Microphone manufacturers
provide this capacitor directly soldered on the microphone.
VCC analog power supply
2.8V
MIC1N
C2
C1
MIC1P
R1
R2
R3
R4
Summary of WMOi3
Page 1
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Page 2
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Page 3: Wmoi3
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Page 4
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Page 5
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Page 6: Cautions:
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Page 7
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Page 9
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Page 10
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Page 11
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Page 15
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Page 16
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Page 21
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Page 24
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Page 25
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Page 26
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Page 27
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Page 28
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Page 29
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Page 30
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Page 31
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Page 32
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Page 33
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Page 34
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Page 35
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Page 36
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Page 37
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Page 38
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Page 39
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Page 40
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Page 41
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Page 42
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Page 43
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Page 44
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Page 45
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Page 46
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Page 47
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Page 48
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Page 49
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Page 50
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Page 51
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Page 52
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Page 53: Figures
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Page 54
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Page 55
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Page 57
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Page 59
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Page 60
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Page 61
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Page 62
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Page 63
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Page 64: Low Profile Sockets
Clp–110–02–f–d–p clp–130–02–l–d clp–116–02–l–d clp–116 – 02–f–dh high reliability tiger-claw contacts low profile (2,21mm) .087" (1,27mm x 1,27mm) .050" x .050" micro pitch surface mount suitable for pass-through applications samtec usa • tel: 1-800-samtec-9 or 812-944-6733 • fax: 812-948-5047 samte...
Page 65: Standard Socket
Samtec usa • tel: 1-800-samtec-9 or 812-944-6733 • fax: 812-948-5047 samtec uk • tel: 01236 739292 • fax: 01236 727113 samtec asia pacific • tel: 65-745-5955 • fax: 65-841-1502 samtec germany • tel: +49 (0) 89 / 89460-0 • fax: +49 (0) 89 / 89460-299 samtec france • tel: 01 60 95 06 60 • fax: 01 60 9...