I am designing a RFID Module using MFRC522 chip. So while designing the layout of the board, I wanted to confirm the impedance matching to be performed on TX1 and Tx2 lines . I want my Rmatch to be 50 Ohms. Then do I need both TX1 and Tx2 traces to be 50 Ohms single endedly or should the differential impedance between them be 50 ? I think it is differential but still I would like it confirmed.