參數(shù)資料
型號(hào)： Q2406D
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)： 33/81頁
文件大?。?/td> 922K
代理商： Q2406D
WM_PRJ_Q2400_PTS_002 - 002
24th January 2003
confidential
Page :
33 / 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.
Pin description
Signal
Pin #
I/O
I/O type
Description
MIC1P
42
I
Analog
Microphone 1 positive
input
MIC1N
44
I
Analog
Microphone 1 negative
input
2.12.2 Common speaker outputs characteristics
The connection can be differential or single-ended
but using a differential
connection to reject common mode noise and TDMA noise is strongly
recommended. Morover in single-ended mode, of the power is lost
. 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.
Speaker outputs SPK2 are push-pull amplifiers and can be loaded down to 150
Ohms and up to 1nF (see details in table Speaker gain vs Max output voltage).
These outputs are differential and the output power can be adjusted by step of
2dB. The output can be directly connected to a speaker.
2.12.2.1 Differential Connection
Impedance of the speaker amplifier output in differential mode :
R
≤
1
+/-10%
SPKxP
SPKxN
Figure 6 : SPK outputs (differential mode)
2.12.2.2 Single-ended Connection
Typical implementation:
SPKxP
C1
+
SPKxN
C2
+
Z
HP
Speaker
C3
33 to
100pF
R1
Figure 7 : SPK outputs (single-ended connection)
C1 = from 4.7μF to 47μF as per the speaker characteristics and the output
power.
C1=C2 ; R1= Speaker Impedance
Using a single-ended connection also includes losing half of the output power
compared to a differential connection.
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