The discrete balun in the CC2538 reference design (C371, C381, L371, L372, C382, L372, L381) can be replaced by the IC balun from Murata (see AN107 www.ti.com/lit/swra380) or Johanson Tech (see AN081 www.ti.com/lit/swra297). Include placeholders for L373, C373, L375. They can be used for impedance matching and filtering if needed. Initially you can set L373 and L375 as 0 ohm resistors and do not mount C373.
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