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Wavecom WMOi3 User Manual - page 33
January 2001/ version 1.4
WMOi3 Integrated Modem
confidential ©
33/61
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.
4.1.10 Audio Interface
Two different microphone inputs and two different speaker outputs are supported.
The connection can be either differential or single-ended but using a differential
connection in order to reject common mode noise and TDMA noise is
recommended.
4 . 1 . 1 0 . 1
4 . 1 . 1 0 . 1 Microphone
Microphone 2 Inputs
2 Inputs
The MIC2 inputs are differential ones. They already include the convenient
biasing for an electret microphone (0,5 mA and 2 Volts). This electret
microphone can be directly connected on these inputs. The impedance of the
microphone 2 has to be around 2k
Ω
. These inputs are the standard ones for a
handset design while MIC1 inputs can be connected to an external headset or a
handsfree kit.
The gain of MIC2 inputs is internally adjusted. The gain can be tuned from 30dB
to 51dB. The connection to the microphone is direct. The gain can be tuned
using the AT+VGR command.
See chapter Connector suppliers and peripheral devices.
C1 = 22pF to 100pF
33 pF recommanded
figure 10 : microphone 2 input
C1 has to be the nearest as possible to the microphone. Microphone
manufacturers provide this capacitor directly soldered on the microphone.
Table 18 : microphone 2 input pin description
Signal
Pin #
I/O
I/O type*
Description
MIC2P
16
I
Analog
Microphone 2 positive input
MIC2N
18
I
Analog
Microphone 2 negative input
*See Table 3 “operating conditions” in subdivision 4.1.1
The 50-pin
connector description
C1
MIC2P
MIC2N
Summary of WMOi3
Page 1
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Page 6: Cautions:
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Page 41
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Page 44
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Page 45
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Page 46
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Page 48
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Page 49
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Page 50
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Page 53: Figures
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Page 55
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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...