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LMH1208: LMH1218

Donald Wood
Prodigy 10 points
Part Number: LMH1208
Other Parts Discussed in Thread: LMH1297, LMH1226, LMH1219, LMH1218, LMH1228, LMH1297EVM, LMH1229

Tool/software:

We are being asked to design a 3U 160 mm card with e 75-ohm BNC to 100-differential convertor. The signal speed is 3G to 12G The distance from the card to the appropriate slots on our backplane is about 6 inches. The Connector interface from the card to the backplane is TE connectivity RT3 VITA 46 connectors. The cable length could be as length as 100 feet. We are looking at the following TE parts. Looking for information regarding layout. signal integrity documents that may have been done. Parts I have down loaded are as follows.

LMH1208, LMH1218, LMH1219, LMH1226, LMH1228,, LMH1297

My-email is dwood@atrenne-ca.com

Work office phone 508-818-5297

Thank you in advance for your assistance.

Donald Wood

  • 0
    TI__Expert 5090 points

    Hi Donald,

    We are reviewing this case and will get back to you shortly.

    Best,

    Nick

  • 0 in reply to Nick Peabody
    TI__Expert 5090 points

    Hi Donald,

    Based on your requirements for a long input cable length, an equalizer and reclocker combination device would be well suited. For a long cable like 100m our new device the LMH1229_39 would be a viable option. 

    Donald Wood said:
    Looking for information regarding layout. signal integrity documents that may have been done.

    Most of our devices have IBIS-AMI files for simulation. As for layout, you can request the .brd file that we used for our EVMs as a reference. The LMH1297EVM can be used a reference in your own design. Signal integrity information will come from the datasheet parameters. I advise you to look closely at cable reach specifications for each device. As I mentioned above, the LMH1229 has some of the best performance in that area, but it is a new device and therefore lacks an IBIS-AMI file and some other resources that the previous devices already have.

    Can you send us a block diagram of the application?

    Best Regards,

    Nick