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Original question:

LMH6559: Typical Schematic

LMH6559: LMH6559 Schematic

user5994204
Prodigy 185 points
Part Number: LMH6559

Thanks a lot to Sean for answering the last question about LMH6559 typical schematic.But I still have some questions.

1.How does the coaxial cable connect to the conductor at the cross 1、 2、 3 with the red mark?   Is it to strip the insulation cover off a coaxial cable and expose the copper conductor, connect the copper conductor of coaxial cable and conventional wire?

2.Where does the VEE come in? Is it just that enter directly from pin 5 without going through other components or conductors?

                                       coaxial cable

  • 0
    TI__Genius 16706 points

    1. Typically, the coaxial cable has a SMA connector at the end which you screw onto a pcb mounted connector. The sheilding is then electrically connected to the ground plane of the board. The internal signal trace of the coaxial wire goes through a PCB trace to the amplifier.

    2. In this case, Vee is ground. It can be connected to the nearest available ground plane.

  • 0 in reply to Sean Cashin
    Prodigy 185 points

    Thank you ,your answer is very clear !

    But about the second point,I still confused.

    If the signal passed is positive and negative (±5V), VEE should be connected to -5V ~ -6V, then this circuit structure is still applicable? If not, the improved way is to connect pin 5 to the power supply without connecting to the ground?

    Best Regard

  • 0 in reply to user5994204
    TI__Genius 16706 points

    Yes, for a +-5V signal, you should connect Vee to -6V instead of to ground.