The DS90UB633A/662 chipset is intended to be used in a point-to-point configuration through a shielded coaxial cable. The serializer and deserializer provide internal termination to minimize impedance discontinuities. The interconnect (cable and connectors) must have a differential impedance of 100 Ω, or a single-ended impedance of 50 Ω. The maximum length of cable that can be used is dependent on the quality of the cable (gauge, impedance), connector, board(discontinuities, power plane), the electrical environment (for example, power stability, ground noise, input clock jitter, PCLK frequency, etc.). The resulting signal quality at the receiving end of the transmission media may be assessed by monitoring the differential eye opening of the serial data stream. A differential probe should be used to measure across the termination resistor at the CMLOUTP/N pins.

Contact TI for a channel specification regarding cable loss parameters and further details on adaptive equalizer loss compensation.