The ISL59442 is a single-output 4:1 MUX-amp. The MUX-amp has a fixed gain of 1 and a 1GHz bandwidth. The device contains logic inputs for channel selection (S0, S1), and a three-state output control (HIZ) for individual selection of MUX amps that share a common video output line. All logic inputs have pull-downs to ground and may be left floating. ISL59442EVAL1 Evaluation Board User’s Guide Application Note April 19, 2005 AN1185.0 Introduction High Frequency Layout Considerations The ISL59442EVAL1 evaluation board contains all the At frequencies of 500MHz and higher, circuit board layout circuitry needed to characterize critical performance may limit performance. The following layout guidelines are parameters of the ISL59442 single 4:1 MUX-amplifier, over a implemented on the evaluation board: variety of applications. ……