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Original question:

LMH0340: LMH0340 LVDS Data Output

LMH0340: LMH0340 Can give two SDI ouputs?

Praveen N1
Intellectual 430 points
Part Number: LMH0340

Hi Team,

I am using the LMH0340. In the pin configuration, they have provided TXOUT- and TXOUT+( Which is SDI out). 

It is possible to get two SDI outputs. 

Thanks

  • 0
    TI__Guru* 93670 points

    Hi Praveen,

    Yes you can do this. Please note:

    1). Passive components on both TXOUT+ and TXOUT- should be the same. I mean you should also use 6.8nH inductor plus 75-ohm Resistors as well.

    2). Also, it is a good idea to terminate the output that is not being used.

    Regards,, Nasser

  • 0 in reply to Nasser Mohammadi
    Intellectual 430 points

    Hi Nasser,

    I have attached the schematic pdf of 2 SDI output with LMH0340. Will you pls give your suggestion.

    Thanks.

    SDI_OUT_LMH0340.pdf

  • 0 in reply to Praveen N1
    TI__Guru* 93670 points

    Hi Praveen,

    Please note some comments:

    1). I was expecting to see 4.7K-Ohm R pull up to 3.3V supply on SDA and SCK. Perhaps these are on another page.

    2). Please note RESET* is true on low and its referenced to 3.3V - sam as other control signals.

    3). Please note LOCK* is true on low as well. 

    4). VDD_PLL: Please isolate this pin from pins 1 & 36 by using a zero ohm resistor. This will allow us to use a ferrite bead if your supply supply is too noisy instead of this zero-ohm Resistor.

    5). In your pcb layout, make sure R90 and R93 are in parallel with one another. This magnetic effect would help to improve output eye diagram.

    Regards,, nasser