Sierra Wireless Q2687 Manuel D’Utilisation

 

 

Wireless CPU Quik Q2687 

Interfaces 

 

 

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prior written agreement. 

 

WA_ENG_Q2687_PTS_001-002 

September 11, 2006

 

 

 

 

Electrical characteristics of the signals 

Parameter 

Min 

Typ 

Max 

Unit 

VPAD-USB, USB-DP, USB-DM 

3 

3.3 

3.6 

V 

3.26 

RF Interface 

The impedance is 50 Ohms nominal and the DC impedance is 0 Ohm. 

3.26.1 RF Connections 

U.FL Connector 

A wide variety of cables fitted with U.FL connectors is offered by different 

suppliers. 

Soldered solution  

The soldered solution will preferably be based on an RG178 coaxial cable. 

IMP connector  

This connector is dedicated to board-to-board applications and must be soldered 
on the customer board. The supplier is Radiall (reference: R107 064 900). 

Notes: 

•  The Wireless CPU Quik Q2687 does not support an antenna switch for a car kit 

but this function may be implemented externally and may be driven using a 

GPIO. 

•  The antenna cable and connector should be selected in order to minimize 

losses in the frequency bands used for GSM 850/900MHz and 1800/1900MHz. 

•  0.5dB may be considered as the maximum value of loss between the Wireless 

CPU and an external connector. 

•  For mounting, assembling and handling of the IMP connector,  contact the 

supplier, Radiall, directly. Wavecom may not provide customer support for use 

of this connector. 

3.26.2 RF Performance 

RF performance is compliant with the ETSI GSM 05.05 recommendation. 

The main Receiver parameters are:  

•  GSM850 Reference Sensitivity = -104 dBm Static & TUHigh 
•  E-GSM900 Reference Sensitivity = -104 dBm Static & TUHigh 

•  DCS1800 Reference Sensitivity = -102 dBm Static & TUHigh 
•  PCS1900 Reference Sensitivity = -102 dBm Static & TUHigh 
•  Selectivity @ 200 kHz: > +9 dBc