Emc And Esd Recommendations - Sierra Wireless AirPrime SL808 Series Product Technical Specification & Customer Design Manuallines

Product Technical Specification & Customer Design Guidelines
Table 8-1: ESD specifications
100 Proprietary and Confidential - Specifications subject to change
The GSM/GPRS connector is intended to be directly connected to a 50 
antenna and no matching is needed.

8.8 EMC and ESD recommendations

EMC tests have to be performed on the application as soon as possible to detect
any potential problems.
When designing, special attention should be paid to:
• Possible spurious emissions radiated by the application to the RF receiver in
the receiver band
• ESD protection is mandatory on all signals which are externally accessible
· Typically, ESD protection is mandatory for the:
· SIM (if accessible from outside)
· Serial link
• Length of the SIM interface lines (preferably <10 cm)
• EMC protection on audio input/output (filters against 900 MHz emissions)
• Biasing of the microphone inputs
• Ground plane: Sierra Wireless recommends a common ground plane for
analog/digital/RF grounds
• A metallic case or plastic casing with conductive paint are recommended,
except area around the antenna
Note: The AirPrime SL808X Embedded Module does not include any protection against
over voltage.
The host device must provide adequate ESD protection on digital circuits and
antenna ports as detailed in
Note: The level of protection required depends on your application.
Category Connection
Operational RF ports
Non-operational Host connector interface
USIM connector
Signals
Other host signals
Table 8-1.
Specification
IEC-61000-4-2—Level (Electrostatic
•
Discharge Immunity Test)
Unless otherwise specified:
JESD22-A114-B +/- 2kV Human Body Model
•
JESD22-C101 +/- 300V Charged Device
•
Model
ESD protection is highly recommended at the
point where the USIM contacts are exposed, and
for any other signals that would be subjected to
ESD by the user.
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