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LMH6586: support of single input to all channel output support

Gagandeep Singh
Prodigy 90 points
Part Number: LMH6586

Hello TI Team 

We have one below query regarding the LMH6586 chip.

As our requirement we want to configure cross point switch with input at single channel (NTSC/PAL) video signal and that signal will be output all 16 output channel at the same time .

1) Is this configuration is possible with this ?

2) Do We need to add any other IC / discrete to implement this ?

I hope my question is clear. In short, Configuration is all output channel are configured to single input channel 

  • 0
    TI__Mastermind 28088 points

    Hello Gagandeep,

    You should be able to do this with just the LMH6586 by shorting 16input pins together and run each of those pins to a different output so you'll have what you're looking for ; 16pins shorted to one output. The signals will be buffered so the fanout you're looking for is feasible, however I would be concerned about the capacitance you would accumulate by doing this, which could significantly slow down your signals. 

    Thanks,
    Rami

  • 0 in reply to Rami Mooti1
    Prodigy 90 points

    Hello Rami 

    Thanks for the reply

    Let me elaborate my requirement , as getting video at all output from single input channel is one of the required configuration. So we cannot shorting 16 pins .

    As per datasheet 

    1) "The LMH6586 is a non-blocking analog video crosspoint switch designed for routing standard NTSC or PAL composite video signals. The non- blocking architecture allows any of the 32 inputs to be connected to any of the 16 outputs, including any input that is already connected'

    We are understanding as this support non blocking feature that would allow us to configure all output to single channel input , please correct us if our understanding is not correct 

    2) As we can configure output channel through I2C and configuration table is also provided in datasheet , Can we configure all output to single input ? any challenges for this configuration?

  • 0 in reply to Gagandeep Singh
    TI__Mastermind 28088 points

    Hey Gagendeep,

    This should be feasible via I2C configuration. To me it seems that the default is where all the outputs are pointing towards input 1 but i'm not fully certain about the impact on the actual signal integrity by doing this and this datasheet is a little bit older so the way it's presented may be a little misleading. It's definitely worth testing out for yourself in software but I will also dig into this tomorrow as today is a TI holiday and will get back to you on this. Expect a response by end of day tomorrow.

    Thanks,
    Rami

  • 0 in reply to Rami Mooti1
    TI__Mastermind 28088 points

    Hey Gagendeep,

    Just confirming that you should be able to connect any output to any input via I2C with multiple outputs being selected. There shouldn't be an issue here since the signals are buffered as well. 

    Thanks,
    Rami

  • 0 in reply to Rami Mooti1
    Prodigy 90 points

    Hello rami

    So we understand, all 16 outputs can be configured to connect to the same input simultaneously . Is this understanding correct?

  • 0 in reply to Gagandeep Singh
    TI__Mastermind 46777 points

    Hi Gagandeep,

    Yes your understanding is correct. 

    Best,

    Parker Dodson