The LMK1D210x inputs can be interfaced with LVDS, LVPECL, HCSL, or LVCMOS drivers.

LVDS drivers can be connected to LMK1D210x inputs with DC and AC coupling as shown Figure 8-3 and Figure 8-4, respectively.

Figure 8-3 LVDS Clock Driver Connected to LMK1D210x Input (DC-Coupled)

Figure 8-4 LVDS Clock Driver Connected to LMK1D210x Input (AC-Coupled)

Figure 8-5 shows how to connect LVPECL inputs to the LMK1D210x. The series resistors are required to reduce the LVPECL signal swing if the signal swing is >1.6 V_PP.

Figure 8-5 LVPECL Clock Driver Connected to LMK1D210x Input

Figure 8-6 shows how to couple a LVCMOS clock input to the LMK1D210x directly.

For unused input, TI recommends grounding both input pins (INP, INN) using 1-kΩ resistors.