Huawei MC509 CDMA LGA manual EMC and ESD Features, Usb

5.7 EMC and ESD Features

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 the following:

Possible harmful 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 following:

−UIM (if accessible from outside)

−Serial link

−USB

−Audio

Length of the UIM interface lines (preferably <10cm).

EMC protection on audio input/output (filters against 900MHz emissions).

Biasing of the microphone inputs.

Ground plane: HUAWEI Wireless recommends a common ground plane for analog/digital/RF grounds.

A metallic case or plastic casing with conductive paint is recommended, except for the area around the antenna.

The HUAWEI MC509 Module does not include any protection against over voltage.