NEED >> NIM-puls/TTL converter <<

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2 total messages Started by peny@ppc.lpc.eth Thu, 10 Feb 1994 18:30

Author: peny@ppc.lpc.eth
Date: Thu, 10 Feb 1994 18:30

25 lines
693 bytes

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?

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Re: NEED >> NIM-puls/TTL converter <<

Author: lane@duphy4.phys
Date: Sun, 13 Feb 1994 07:50

28 lines
1168 bytes

In article <CL0u2H.Fwo@murdoch.acc.Virginia.EDU>, peny@ppc.lpc.ethz.ch (Peter Nyffeler) 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?
>

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
----------------->--------*------------<--------lane@duphy4.hepnet
     (215) 895-1545      / \  Particle Physics  lane@duphy1.bitnet
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