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LMH0302 disabled is 3-state?

Stefano Grasso
Prodigy 30 points
Other Parts Discussed in Thread: LMH0302, LMH0384, LMH0387

Hi,

I need to know if the output of LMH0302 is a real 3-state when chip is disabled (ENABLE = GND).

Bye

  • 0
    TI__Genius 13475 points

    Stefano

    The easiest way to think of the output of the LMH0302 is like a CML output (looks like a differential pair with a current source on the emitter tail).   When the chip is disabled, the current source is turned off, when enabled there is a current sink from one output or the other.    A 'real 3-state output' would have high output impedance when disabled, and low output impedance when enabled, the LMH0302 always has a high output impedance (current source), and the output impedance is set with the external load resistors.

    Mark

  • 0 in reply to Mark Sauerwald88474
    Prodigy 30 points

    Thank you Mark,

    I'm thinking about putting toghether a cable driver and a cable equalizer (LMH0302 and LMH0384) on the same BNC connector...I don't need to be really 3G-SDI compliant. Do you think it's possible? 

    (I know it could be best done with the LMH0387, but I'm trying to use more standard components).


    Stefano

  • 0 in reply to Stefano Grasso
    TI__Genius 13475 points

    It is possible, but very difficult, especially if you need/want to meet the SMPTE return loss specs for the connector - I would strongly encourage you to use the LMH0387 which was designed especially for this purpose - and the cost should be lower than for the LMH0302 and LMH0384 combined.

    Mark

  • 0 in reply to Mark Sauerwald88474
    Prodigy 30 points

    Thank you very much,

    Stefano