A Power-over-Coax (PoC) network separates the high-speed data signal from the DC power on a coaxial cable. The high-speed data consists of a high-speed forward channel carrying video and control data to the Deserializer and a lower speed back channel carrying control data to the serializer. The Serializer and Deserializer network is implemented with the FPD-Link technology from TI.

For more information on PoC see Power-over-Coax Design Guidelines for DS90UB953-Q1.

With the usage of PoC, the maximum current delivered to the camera module is limited due to the current rating of different components in the power path, like the connectors, coaxial cable and PoC inductors. The maximum current rating of these components is typically in the 1 A range and shall not be exceeded to minimize cables losses and prevent saturation effects on the PoC inductors.

The procedure to determine the required current rating for a given LED configuration is described in the Design Steps section.