SNOSDC1 June 2024 LMH1229
ADVANCE INFORMATION
The LMH1239 can be configured as a cable equalizer with redundant SDI input for applications requiring system robustness and routing flexibility. The SDI input data is selected from either SDI_IN or SDI_IN1 by the 2:1 input mux. The chosen SDI input is then fed through the adaptive cable equalizer, and the reclocked SDI signal is output on OUT0 (primary output) and OUT1 (optional secondary output). Meanwhile, a redundant reclocked loop-through SDI signal is output on SDI_OUT for system monitoring or cascade purposes.
Figure 7-10 shows a typical application of a LMH1239 with redundant SDI input. In this example, the LMH1239 selects between a primary BNC input (SDI_IN) and a back-up BNC input (SDI_IN1). In this use case, SDI_IN1 is only used if issues are found at SDI_IN. The LMH1239 provides an SDI signal to the SDI FPGA on both OUT0 and OUT1.