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Connect ECL device to PECL-TTL translator

J

Johan Lucas

Jan 1, 1970
0
Hello,

Currently I am developing a board which interfaces with an ECL device.
These ECL diff. pairs need to be converted to TTL for data processing.

But all the translators I found require a negative voltage supply.
This is not an option because then I have to use DC-DC converters and
that will make the board to expensive.

Is there any proven solution to connect ECL diff pairs to a PECL-TTL
translator?

My idea was to use a capacitor and a two resistors to shift the ECL
level from -1.6 for low and -0.8 for high to PECL levels. But a DC
level on the ECL line would not work.

Can you help me?
 
M

Marc Randolph

Jan 1, 1970
0
Hello,

Currently I am developing a board which interfaces with an ECL device.
These ECL diff. pairs need to be converted to TTL for data processing.

But all the translators I found require a negative voltage supply.
This is not an option because then I have to use DC-DC converters and
that will make the board to expensive.

Is there any proven solution to connect ECL diff pairs to a PECL-TTL
translator?

My idea was to use a capacitor and a two resistors to shift the ECL
level from -1.6 for low and -0.8 for high to PECL levels. But a DC
level on the ECL line would not work.

Can you help me?

Howdy Johan,

The datasheet for parts related to the MC100EPT23 appear to show that
it operates down to 0 Hz, which would imply that it would not have a
problem with your scheme.

Have fun,

Marc
 
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