User's Manual
ZigBee- Ready RF Transceiver Module CTL3576/7/8/9
Copyright © 2011 Computime Limited. All rights reserved. Rev. 1
15 2425MHz
16 2430MHz
17 2435MHz
18 2440MHz
19 2445MHz
20 2450MHz
21 2455MHz
22 2460MHz
23 2465MHz
24 2470MHz
25 2475MHz
26 2480MHz
Note: the output 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 reference 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