User's Manual

ZigBee-
Ready RF Transceiver Module CTL3576/7/8/9
Cop
yright © 2011 Computime Limited. All rights reserved. Rev. 1
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Note: the o
utput power of EM357 should be configured lower than -15dBm for 2480M channel
to Comply FCC requirement.
The use of RF frequencies and maximum allowed RF power should according to different national
regulations. The CTL3576 is complying with the applicable regulations for the world wide 2.4GHz
ISM band.
12.
PCB Layout Recommendations
Please refer
ence Mechanical Dimensions shown in next section for PCB layout.
The area underneath the module should be covered with solder mask in order to prevent short
circuit on the test pads on the back side of the module. A solid ground plane under the module is
preferred.
As the module integrated with onboard PCB trace antenna, the mounting position of the module will
have great impact on the RF performance. There should not be any trace, ground plane or metal
part underneath or nearby the area of the onboard PCB trace antenna. The figure below shows an
example how the module positioned on the mother PCB.
Figure 4: A recommended placement of the module on a main PCB