NEED >> NIM-puls/TTL converter <<
Peter Nyffeler
Are there IC's for this?
Do you know a reference?
Any other hints?
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Ivan D. Reid
pe...@ppc.lpc.ethz.ch writes...
>I need a circuit to convert NIM-puls to TTL
> and TTL to NIM-puls for up to 100MHz
> Are there IC's for this?
> Do you know a reference?
> Any other hints?
LeCroy offer Model 688AL Nim-to-TTL & TTL-to-NIM converter, with
8 channels each way. They're switchble in groups of four between
normal/complement. TTL output rise/fall-times <10 ns; NIM output rise/fall-
times <3 ns.
LeCroy SA, Bahnhoffstrasse 18, 5600 Lenzburg.
Ph. (064) 51 91 81; Fax. (064) 51 91 92
Ivan Reid, Paul Scherrer Institute, CH. iv...@cvax.psi.ch
Guess I'd better say: No affiliation with LeCroy, except as a sometimes-
satisfied customer. idr
Dan....@fnnews.fnal.gov
>I need a circuit to convert NIM-puls to TTL and TTL to NIM-puls for up to 100MHz
To convert TTL to NIM we use a pair of Motorola MECL 10000 series ICs.
We first convert the TTL signal to MECL with an MC10124 quad TTL to MECL
translator. All outputs are pulled to -5.2 through a 470 ohm resistor. The non
inverting outputs are connected to the inputs of an MC10192 quad buss driver.
Leave the ENABLE inputs on the MC10192 open. The output of the MC10192 is NIM
standard. Either the inverting or non inverting output of the MC10192 can be
used depending whether you want an inverted signal or not. The unused output
is terminated to ground through a 51 ohm resistor.
V
(o o)
( V )
.......m.m...........Dan's Cockatoo Ranch
vvv
Daniel Schoo
Electronics Design Engineer
Fermilab, Batavia, Illinois, USA
Charles Lane
> I need a circuit to convert NIM-puls to TTL and TTL to NIM-puls for up to 100MHz
>
> Are there IC's for this?
> Do you know a reference?
> Any other hints?
>
You can use ECL chips 10124 (TTL->ECL) and 10125 (ECL->TTL). ECL and NIM
levels are similar with a ~0.8V offset. The 10125 has differential inputs
however, so it can be used directly to get TTL from a NIM input.
For TTL->NIM I've used a 10124 to convert to ECL, then use a 10192
ECL line driver (differential pull-down outputs) with a LED for a pull-up
to ground. The LED limits the unloaded output voltage to about 1.3V...
with a 50-ohm load (standard for NIM signals) you get ~0.8V pulses.
Both of these functions can also be done with 2-3 transistors/channel,
and I don't have schematics easily at hand.
--
Drexel University \V --Chuck Lane
----------------->--------*------------<------...@duphy4.hepnet
(215) 895-1545 / \ Particle Physics la...@duphy1.bitnet
FAX: (215) 895-5934 /~~~~~~~~~~~ la...@duphy4.physics.drexel.edu
Jeroen Belleman
Peter Nyffeler <pe...@ppc.lpc.ethz.ch> wrote:
>I need a circuit to convert NIM-puls to TTL and TTL to NIM-puls for up to 100MHz
>
> Are there IC's for this?
> Do you know a reference?
> Any other hints?
LeCroy used to make a NIM modele containing a bunch of NIM-TTL and
TTL-NIM converters. It was known as the '688'. Give them a call, if
you like, at:
LeCroy SA
2, Chemin pre-de-la Fontaine
CH-1217 Meyrin 1
phone (022) 7192111
There are no ICs to do this, to my knowledge.
Alternatively, you can build your own, using discrete differential
pair transistor switches. The use of non-saturated switching is
essential at this speed.
Good luck,
Jeroen Belleman
jer...@dxcern.cern.ch
Kate Scholberg
I have done NIM to TTL and TTL to NIM conversion with Motorola MC10125
and 10124 chips, as others have already described. I have also seen
some ideas for NIM/TTL conversion which do not use these chips in
"Building Scientific Apparatus" by Moore, Davis and Coplan,
2nd edition, Addison-Wesley, p. 450.,
although I have not actually tried them.