LVPECL to PECL to LVPECL

[Rene Tschaggelar]

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

 

[Andrew Holme]

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

 

[Andrew Holme]

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.

 

[[email protected]]

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. ;-)