Figure 12-7. PCB Stack Up
The technical specification of the approved chip and external antenna is listed in
12.1.1.1 Test Procedure for Ensuring Compliance
The following test must be performed both at the design verification stage and in production to ensure compliance.
1.
Initiate Continuous Transmission in the appropriate modulation mode from the device that is, 868.3 MHz;
BPSK-20 for European band and 914 MHz; BPSK-ALT-40 for North American band.
2.
Verify RF power through conducted measurement at junction between L106 and L105.
3.
Remove L106 and R115 to isolate the antenna path from the measurement point. It is recommended that
the measured TX power be within the data sheet specification for the Transmit output power. For good
measurement, it is recommended that there be a firm connection between the copper core of the coaxial cable
and the measurement point. Ensure the copper shield of the coaxial cable is firmly connected to the GND of
the PCB.
Figure 12-8. RF Front End with Measurement Point
ATSAMR30M18A
Application Reference Design
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and its subsidiaries
Datasheet
DS70005384B-page 48