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Equalizer or Repeater for V-by-one interface

Kuo CH
Prodigy 50 points
Other Parts Discussed in Thread: DS38EP100

Hello,

Could you tell me which equalizer or repeater IC support the V-by-one interface?  (www.thine.co.jp/.../THCV215.html)

Condition: 1. The frequency support up to 3.75Gbps data rate.

2. The working voltage is 1.8V.

Thanks!

Achilles.

  • 0
    TI__Mastermind 29655 points
    Hi Achilles,

    We have multiple equalizer/repeater devices that can work with the 3.75 Gbps V-by-one HS interface you have shown. However, we do not have any active products that work with a 1.8 V supply. Please see the following thread for more information: e2e.ti.com/.../318443

    I think one possible solution for your application is, for each channel, to use a passive equalizer such as the DS38EP100. This device is rated for 1-5 Gbps operation, has a small 2.2 mm x 2.5 mm package, and requires no supply power to operate.

    Regards,

    Michael
  • 0 in reply to Michael Lu (Santa Clara)
    Prodigy 50 points

    Hi Michael,

    It's good news for me, I will try this IC(DS38EP100). Thank you!

    But I found a question on PCB layout, because of some connectors pin define limited, if the differential positive pin has to connect to IOA+ of DS38EP100, the negative pin has to connect to IOA- of DS38EP100 then these two pins will cross each other on my PCB. 

    I check the datasheet, no data show IOA+ & IOA- are input, or IOB+ & IOB- are output pins, right? So, can I connect the input signal to the IOB+ & IOB-?

    Or connect differential positive pin to IOA-, negative pin to IOA+? What should I do?

    Thanks!

    Achilles.

  • 0 in reply to Kuo CH
    TI__Mastermind 43795 points

    Hi Achilles,

    Either of your routing solutions are good.  Since the DS38EP100 is symetrical between the A - B ports and the Plus - Minus pins you can adjust the routing so that you avoid crossing the signals on the PCB.  I have included the two examples below.

    SYS+   ->   IOA-  (EP100)  IOB-    ->   SYS+

    SYS-   ->    IOA+ (EP100)  IOB+    ->   SYS-      

    SYS+   ->   IOB+  (EP100)  IOA+    ->   SYS+

    SYS-   ->    IOB-   (EP100)  IOA-     ->   SYS-  

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    Prodigy 50 points

    Hi Lee,

    Thanks your reply.

    But I have another question, could the DS38EP100 apply to AC coupling signal interface, like V by one signal?

    We also link capacitances between TX IC and RX IC on V by one interface. 

    Very your sincerely,

    Achilles.

  • 0 in reply to Kuo CH
    TI__Mastermind 43795 points

    Hi Achilles,

    Yes the DS38EP100 is fully compatible with AC coupled signals.

    Regards,

    Lee