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LMH0340: The schemetic review

user6544449
Intellectual 795 points

Part Number: LMH0340
Other Parts Discussed in Thread: LM340,

Hello teams, 

Could you pls help me review the schemetic of LMH0340SQE, thanks !

  • +1
    TI__Guru* 93570 points

    Greetings,

    Schematic looks fine. A couple of minor comments:

    1). D229: This lightening protection part may affect return loss/eye diagram. Perhaps when you get your board back you can load and unload this part to observe the effects. 

    2). I am assuming there are pull up Resistors on SDA and SCK and these are not shown in the schematic.

    Regards, Nasser

  • +1 in reply to Nasser Mohammadi
    Intellectual 795 points

    Hello Nasser,

    One more another question. According to datasheet  "Table 1. Feature Table", my chip LM340 do not support DVB-ASI, and what do we need to config the pin 6?

    And , my FPGA output is 1.8V level, is it conpitable for TXCLK or TX0~4?

    Thanks!

  • +1 in reply to user6544449
    TI__Guru* 93570 points

    Greetings,

    1). LMH0340 supports all modes including DVB-ASI. If you do not need to support DVB-ASI, then you can make this pin L"" - as noted in pin description table.

    2). 1.8V common mode voltage is fine. Device common LVDS input common mode voltage is between 0.05 to 2.4V.

    Regards, Nasser