SDBC-DK3UG Datasheet, PDF (29/76 Pages) Silicon Laboratories – 4 buttons and 4 LEDs for custom purposes

SDBC-DK3 UG
7.2.4. Results (CW Tests)
7.2.4.1. Output Power
1. Set the center frequency of spectrum analyzer to the frequency under test.
2. Set span to 10 MHz.
3. Measure the TX output power on displayed plot.
Figure 34. Spectrum Plot Showing CW Output at 917 MHz
7.2.4.2. Frequency Offset at Transmitter Output
1. Set the center frequency of spectrum analyzer to the frequency under test.
2. Set span to 100 kHz.
3. Measure the frequency offset between the expected frequency as selected in the menu and the actual TX
output frequency.
Figure 35. Typical Spectrum Plot Using a Silicon Labs Branded Testcard
In Figure 35, it can be seen that the frequency error is less than 1 kHz.
Silicon Labs testcards are designed to have a maximum frequency error of < 5 kHz.
Rev. 0.4
29