A common-mode signal is an average voltage of the two signal wires that the differential receiver rejects. The common-mode signal comes from the CAN driver, ground noise, and coupled bus noise. The TCAN341x family has the recessive bias voltage set to 1.9V. This is intentional to match the common mode of recessive output with the common mode of dominant output signal from TCAN341x. Furthermore, TCAN341x has special design techniques for optimum EMC performance in a heterogeneous bus consisting of TCAN341x and 5 V CAN transceivers.