Laird MSD45N
Hardware Integration Guide, version 1.1
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/wireless
16
Laird Technologies
Americas: +1-800-492-2320 Option 2
Europe: +44-1628-858-940
Hong Kong: +852-2268-6567 x026
Mounting
The MSD45N connects to the host via a 60-pin connector. In addition, there are three mounting holes used
to secure the device to the host using 2 mm mounting screws.
Laird recommends a 1.5 mm metal spacer (bushing) with a conductive mounting screw to connect the
exposed ground pads of the radio circuit board to the host ground plane. A 1.5 mm conductive metal spacer
with a maximum OD of 4 mm maximizes grounding of the radio and helps to reduce emissions from the
radio circuit board. The spacer may also prevent the MSD board from slanting and breaking the connection
to the host device when the board is attached to the host.
Figure 7: Mounting Recommendations
RF
L
AYOUT
D
ESIGN
G
UIDELINES
The following is a list of RF layout design guidelines and recommendation when installing a Laird radio into
your device.
Do not run antenna cables directly above or directly below the radio.
Do not place any parts or run any high speed digital lines below the radio.
If there are other radios or transmitters located on the device (such as a Bluetooth radio), place the
devices as far apart from each other as possible.
Ensure that there is the maximum allowable spacing separating the antenna connectors on the Laird
radio from the antenna. In addition, do not place antennas directly above or directly below the radio.
Laird recommends the use of a double shielded cable for the connection between the radio and the
antenna elements.
Laird has provided three plated mounting holes that can be used for grounding. When additional ground
plane is required, you may use some or all of these grounded mounting holes.
Use proper electro-static-discharge (ESD) procedures when installing the Laird radio module.
