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16
Pinout and I/O Description
16
4.2.3
Typical Application
4.2.3.1
Single Antenna Modules
The ANT_1 input is DC-biased and ESD-protected, so that no external component is
needed. Make sure to connect the ANT_2 pad to ground.
Refer to 5.5.3 for RF-routing recommendations.
4.2.3.2
Dual-Antenna Modules
The main antenna connects to ANT_1 and the auxiliary antenna to ANT_2. ANT_1 is DC-
biased and ESD-protected, while ANT_2 is AC-coupled and unprotected. A recommended
application circuit is shown below. With this circuit, the DC bias from the ANT_1 pad is
shared between the two antennas.
Note that the combined current drawn by both
antennas must not exceed 150mA in that case.
Refer to 5.5.3 for RF-routing recommendations.
If the pre-amplification gain is higher than 35dB, it is recommended to put attenuators in
the RF path. See Appendix C for instructions.
In addition, the ANT_1 and ANT_2 pre-amplification must not differ by more than 5dB. It
is recommended to use the same antenna type for the main and auxiliary antennas, and,
as much as possible, to use antenna cables of the same type and length. In case this is
not possible, the strongest signal needs to be attenuated, as also described in Appendix
C.
