LVPECL to PECL to LVPECL
in [Design]
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From: krw on 18 May 2010 21:14 On Tue, 18 May 2010 18:32:54 +0100, "Andrew Holme" <ah(a)nospam.com> wrote: > >"Robert Baer" <robertbaer(a)localnet.com> wrote in message >news:t8-dnaB5N5i8bm3WnZ2dnUVZ_oOdnZ2d(a)posted.localnet... >> Andrew Holme wrote: >>> "Rene Tschaggelar" <none(a)none.net> wrote in message >>> news:j0SHn.4900$yx.1201(a)newsfe13.iad... >>>> The supply variety on ECL parts in general has ever >>>> been diminishing over the years, the variety is not >>>> even continuous. I should now connect an FPGA to a >>>> bunch of ECLs. The LVDS to LVPECL translation can be >>>> done with a 65LVDS100. Further I can only find a few >>>> ECL parts and finally I should connect to LVPECL >>>> again. I consider now lowering the Vcc for the PECL >>>> to 3.3V and set the associated GND to -1.9V for a blunt >>>> signal connection. The signals of (LV)ECL in general >>>> are referenced to the respective Vcc, so this should >>>> be doable. >>>> >>>> FPGA-LVDS -> 65LVDS100(3.3V,0V) -> PECL (+3.3V,-1.9V) -> LVPECL(3.3V,0V) >>>> >>>> Differential signal may have less problems than single >>>> ended in this configuration, I guess. A one point I'll >>>> have to go single ended though. >>>> >>>> >>>> Rene >>> >>> MAX9375 is another option for LVDS to LVPECL >> Except that they are one of the infinite number of Maxim parts that are >> not made.. > >Not made in quantity, discontinued or not easy to buy through distribution? They're Maxim. That's enough. >I got samples from Maxim quite recently. Tell us how it works out for you when they can't (or won't) deliver real product. I think we have two Max parts designed in our products. They'll be gone the next time I touch the boards. I've had to train the disties not to use the 'M' word. ;-)
From: Robert Baer on 18 May 2010 23:51
Andrew Holme wrote: > "Robert Baer" <robertbaer(a)localnet.com> wrote in message > news:t8-dnaB5N5i8bm3WnZ2dnUVZ_oOdnZ2d(a)posted.localnet... >> Andrew Holme wrote: >>> "Rene Tschaggelar" <none(a)none.net> wrote in message >>> news:j0SHn.4900$yx.1201(a)newsfe13.iad... >>>> The supply variety on ECL parts in general has ever >>>> been diminishing over the years, the variety is not >>>> even continuous. I should now connect an FPGA to a >>>> bunch of ECLs. The LVDS to LVPECL translation can be >>>> done with a 65LVDS100. Further I can only find a few >>>> ECL parts and finally I should connect to LVPECL >>>> again. I consider now lowering the Vcc for the PECL >>>> to 3.3V and set the associated GND to -1.9V for a blunt >>>> signal connection. The signals of (LV)ECL in general >>>> are referenced to the respective Vcc, so this should >>>> be doable. >>>> >>>> FPGA-LVDS -> 65LVDS100(3.3V,0V) -> PECL (+3.3V,-1.9V) -> LVPECL(3.3V,0V) >>>> >>>> Differential signal may have less problems than single >>>> ended in this configuration, I guess. A one point I'll >>>> have to go single ended though. >>>> >>>> >>>> Rene >>> MAX9375 is another option for LVDS to LVPECL >> Except that they are one of the infinite number of Maxim parts that are >> not made.. > > Not made in quantity, discontinued or not easy to buy through distribution? > I got samples from Maxim quite recently. > > > *Samples*, for a small dinky percentage of advertised part types. Just wait if you need any reasonable quantity. A number of disties dumped Maxim because they could not stock their shelves.. |