Q2686 Wavecom, Q2686 Datasheet - Page 78

• Manufacturer Part Number: Q2686
• Description: Wireless CPU
• Manufacturer: Wavecom

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6 Design Guidelines
The purpose of the following paragraphs is to give design guidelines.
6.1 HARDWARE and RF
6.1.1 EMC Recommendations
The EMC tests must be performed on the application as soon as possible to
detect any potential problems.
When designing, special attention should be paid to:
Note:
The Wireless CPU
This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without
prior written agreement.
WM_PRJ_Q2686_PTS_001-007
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Possible spurious emission radiated by the application to the RF receiver
in the receiver band
ESD protection
accessibility (typically human accessibility). See Q2686 Wireless CPU
Customer Design Guidelines WM_PRJ_Q2686_PTS_003 [10] for ESD
protection samples.
EMC
emissions)
Biasing of the microphone inputs
Length of the SIM interface lines (preferably <10cm)
Ground plane: Wavecom recommends a common ground plane for
analog/digital/RF grounds.
A metallic case or plastic casing with conductive paint are recommended
o
Typically, ESD protection is mandatory for the:
protection
confidential ©
®
does not include any protection against over-voltage.
SIM (if accessible from outside)
Serial link
is mandatory
on
audio
input/output
on all signals which have external
(filters
Q2686 Wireless CPU
against
Design Guidelines
900MHz
March 6, 2007
Page: 77 / 87
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