Resistors R1, R2, R5, and R6 are all 0 ohm resistors. The input terminals (IN+ and IN-) have corresponding sense lines so that the inputs to the device can be terminated on the lines with 50 ohms to an oscilloscope. This allows the input signals to be observed with minimal loading and distortion. If the input signal to the device does not need to be evaluated on an oscilloscope, R5 and R6 can be uninstalled and left open.  

  

The TLV3604EVM has an optional resistor pad on the input (R3) side of the device meant for a 100 Ω resistor. R3 is only needed if applying an unterminated LVDS signal to the board, otherwise it can be left uninstalled.