Wavecom G2 Specifikace Strana 43

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Wireless CPU
®
Q24 Series
Interfaces
Pin description
Signal Pin I/O I/O type Description
MIC1P I Analog
phon siti
42
Micro e 1 po ve
input
MIC1N 44 I An
ive
alog
Microphone 1 negat
input
ctrica acteEle l char ristics
MIC1 Electrical characteristics
Parameters Min Typ Max Unit
DC characteristics - - - - V
AC characteristics
100 Hz<F<5 kHz
Z1 80 120 160
K
3.12.1.3 MIC2 Microphone Inputs
The MIC2 inputs are differential inputs. They already include convenient biasing for
an electret microphone (0.5 mA and 2 volts). This electret microphone may be directly
connected to these inputs.
The impedance of microphone 2 must be around 2 k. These inputs are the standard
inputs for a handset design, while MIC1 inputs may be connected either to an
external headset or a hands-free kit.
AC coupling is already embedded in the Wireless CPU
®
.
Equivalent circuit
DC equivalent circuit AC equivalent circuit
Pin description
Signal Pin I/O I/O type Description
MIC2P 46 I Analog
Microphone 2 positive
input
MIC2N 48 I Analog
input
Microphone 2 negative
©Confidential Page: 42 / 83
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without
prior written agreement.
WM_PGM_Q24NG_PTS_001-005
November 20, 2007
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