HD/SD SDI re-clocker designed to drive serial video data

This post is sponsored by Texas Instruments. The Texas Instruments (TI) LMH0318 is a 3Gbps HD/SD SDI re-clocker with integrated cable driver designed to drive serial video data compatible to SMPTE-SDI and DVB-ASI standards. The clock and data recovery circuit eliminates accumulated jitter and detects the incoming data rate without requiring an external reference clock. The integrated driver with 75ohm and 50ohm outputs enables multiple media options such as coax and FR4 PCB. The integrated 2-to-1 MUX on the input of the LMH0318 enables selection between two video sources, while the programmable equalizer compensates for the PC board loss to extend signal reach. With a wide range clock and- data recovery (CDR) circuit, the on-chip re-clocker automatically detects and locks to serial data from 270 Mbps to 2.97Gbps without the need for an external reference clock and loop filter component, thereby simplifying board design and lowering system cost. The re-clocked serial data can be routed to either the 75ohm or 50ohm transmitter output, or both simultaneously (1-to-2 fan-out mode). The output voltage swing is compatible to ST 424, 344, 292, and 259 standards. A non-disruptive eye monitor allows for real-time measurement of serial data to simplify system start-up or field tuning. The LMH0318 is pin compatible with the12Gbps LMH1218 re-locker.