Figure 3-1 UM980 Minimal Design
L1: 68 nH RF inductor in 0603 package is recommended
C1: 100 nF + 100 pF capacitors connected in parallel is recommended
C2: 100 pF capacitor is recommended
C3: N * 10 μF + 1 * 100 nF capacitors connected in parallel is recommended, and the
total inductance should be no less than 30 μF
R1: 10 kΩ resistor is recommended
3.2 Antenna Feed Design
UM980 just supports feeding the antenna from the external of the module rather than
from the internal. It is recommended to use devices with high power and that can
withstand high voltage. Gas discharge tube, varistor, TVS tube and other high-power
protective devices may also be used in the power supply circuit to further protect the
module from lightning strike and surge.
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