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LMH6580, LMH6581 / about output number.

Sho Ogane
Genius 5575 points
Other Parts Discussed in Thread: LMH6580

Hi all.

The LMH6580/LMH6581 each has eight inputs and four outputs.

My customer ask me 8:1 SW over 140MHz.
Can my customer use this device as 8:1 SW?

This datasheet is described logic diagram.
So if my customer use this device as 8:1 SW, please tell me how to connect. 

Best Regards,
Sho Ogane

  • 0
    TI__Genius 13935 points

    Hello Sho Ogane,

    To use the LMH6580 has 8 inputs, so it can be used 8:1.  To do this you would select one of the four output pins to be your output and then just leave the other three output pins floating.


    The LMH6580 is controlled through a serial interface, so when using it as an 8:1 switch you would leave the three unused outputs set to the high impedance, disabled state. 


    To configure the LMH6580 to be an 8:1 switch: You connect your desired input sources to the 8 input pins and your desired one channel to one of the four output pins.  The other output pins should have a 100 Ohm resistor to ground, but can also be left floating, just make sure to keep them disabled. 

    Regards,

    Loren

  • 0 in reply to Loren Siebert 1
    Genius 5575 points

    Hi Loren san

    Thank you for the reply.

    I understand the it can be used 8:1 and how to treat unused pin. 

    Best Regards,
    Sho Ogane