The CC2544EM (evaluation module) reference design contains schematics and layout files for the CC2544EM module. The reference design demonstrates good techniques for CC2544 decoupling and RF layout. For optimum RF performance: the reference design should be copied accurately. This is a 4-layer PCB reference design with an SMA antenna connector for RF output matched to 50 ohm. A micro USB receptacle (standard type B) is used in the design which allows the module to be powered through USB.