TTL to NIM translation

I assume you're talking about Nuclear Instrumentation Module signals.

Can you explain what you are trying to do?

hi,thanks for reply.

Right now,i am doing a project which to convert the transistor transistor logic(TTL) signal to nuclear instrumentation module (NIM). However, i am assigned to find out why i have to do such conversion, and after a couple of searching..i couldn't find excatly what i wanted. my questions are as below,

1) what to do with the conversion?

2) is there any application do involved in such signals conversion? what are they?

thanks for helping hand

Is this a school/college/university project, or something else? Please answer this as well as you can - the help you get will depend on the answer.

You asked : "1) what to do with the conversion?"

Are you asking "how do I do the conversion"?

You asked: "2) is there any application do involved in such signals conversion? what are they?"

Are you asking for some practical examples where TTL/NIM level translation is used?

John.

this is university project.

my question is,

1) i got a manual from the internet.

lyoinfo.in2p3.fr/cms/cmsecal/TTL_NIM user manual_v10.pdf

i just dont know what is the purpose to do this conversion?

2) yap, i am asking for some practical examples where TTL/NIM level translation is used

TTL to NIM fast negative

NIM signals are fast negative pulses in place of positive TTL pulses. You can find some similarity in NIM and ECL negative pulses. Termination is often 50 ohms. In place of having long duration pulses, NIM pulses use only an edge to trigger something. NIM pulses may also have voltage variation unlike TTL which 1 and 0.

TTL to NIM will mean that a trigger pulses translated into 0 to -1V or near to that level and is of 2ns rise time and about 50ns decay time. NIM does not forbid square negative pulse but often an edge alone is used.

The conversion is needed when two systems, one NIM-based and one using TTL signal levels, must communicate. You can't connect the two directly, it just wouldn't work.

An example would be a system with a NIM bin containing the electronics to measure the output from a detector for a specified time, and a sample changing device (using TTL levels).

When the sample changer had positioned a sample ready for measurement, it would send a "SAMPLE READY" (TTL) signal, which would have to be converted so that the NIM system could use it to start timing and acquiring data.

When the timing interval was complete and the data saved, the NIM system would send a "CHANGE SAMPLE" signal, which would have to be converted the other way for the sample changer to recognize it.