2.1 LMH12xx Device Family

The LMH1297 and LMH0397 device families are 75-Ω bidirectional IOs, which means the devices can be configured either as adaptive cable equalizers or as dual cable drivers. When the user configures one of the devices as an adaptive cable equalizer, there is an additional loop-through port that can be used as an SDI or MADI cable driver, if needed. The LMH1297 device family can be controlled either through a register or pin. Through register control, the cable driver output amplitude can be controlled in 5-mV resolution or per step. Figure 4 shows these configurations.