[SI-LIST] LVPECL to 1.8V HSTL Conversion

  • From: "Jineshwari B - CTD, Chennai." <JineshwariB@xxxxxxxxxxxxxxx>
  • To: si-list@xxxxxxxxxxxxx
  • Date: Mon, 28 Oct 2002 14:43:58 +0530

Hello SI Experts,

In one of the app notes I saw a LVPECL to 1.8V HSTL Conversion as detailed
below,
        
        o(3.3V)                                         o(1.8V)
         |                                              |
        /                                                  /
        \                                                  \            
        /    (127 ohms)                                    /  (100 ohms)
        \                                                  \    
(P Leg)  |                                              |
-------------|------------------------------|
|------------------------------------ |
----------------------------------------------(HSTL Output)
        /                        (AC Coupled)                   /
        \                                               \
        /     (82.5ohms)                                                /
(100 ohms)
        \                                               \       
         |                                               |
         ----------                                            ------------

        ----                                               ------


        o(3.3V)
         |
        /       
        \
        /    (127 ohms)
(N Leg) \
-------------|
        \
        /     (82.5ohms)                         
        \
         |
         ----------
        ----

Does this conversion have any disadvantages. Should we take care of
anything.

Regards,
JJineshwari.B


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