參數(shù)資料
型號： Q2426B
廠商： Electronic Theatre Controls, Inc.
英文描述： SELF CONTAINED E GSM/GPRS 900/1800 OR 850/1900 BI BAND MODULE
中文描述： 自成一體的位置的GSM / GPRS或850/1900畢帶模塊900/1800
文件頁數(shù)： 31/81頁
文件大小： 922K
代理商： Q2426B
WM_PRJ_Q2400_PTS_002 - 002
24th January 2003
confidential
Page :
31 / 81
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 exclusive de WAVECOM. Il ne peut être communiqué ou divulgué à
des tiers sans son autorisation préalable.
2.12.1.3 Auxiliary Microphone Inputs (MIC1)
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
WISMO Quik Q24x6 Series module according to the characteristic of this
electret microphone. These inputs are the standard ones used for an external
headset or a handsfree kit.
AC coupling is already embedded in the module.
2.12.1.3.1
Impedance of the microphone input in differential mode :
Differential connection
Module ON : R
in
= 10K
+/-10%
Module OFF : R
in
>1M
+/-10%
Typical implementation:
L1
L2
C1
C2
C4
C3
MIC1P
MIC1N
VCC
C5
R1
R2
R3
R4
Figure 4 : MIC1 inputs (differential connection)
R1 = R4 = from 100 to 330
R2 = R3 = usually between 1K
and 3.3K
as per the microphone
characteristics
C1 = 10pF to 33pF
C2 = C3 = C4 = 47pF to 100pF
C5 = 47μF
L1 = L2 = 100nH
R1 and R4 are used as a voltage supply filter with C5.
C1 has to be the nearest possible to the microphone. Microphone
manufacturers provide this capacitor directly soldered on the microphone.
C2 has to be very close to the WISMO Quik Q24x6 Series connector.
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