Anyone knows about the CAMAC ttl/nim translator?I need your help pls?

Question

Hi all! i'm willing to know about the nim to ttl circuit..here i have its website address:

http://lyoinfo.in2p3.fr/cms/cmsecal/TTL_NIM%20user%20manual_v10.pdf

I'm doing the part of 2.2.Since the codes of the components aren't very clear, so i cant find the exactly components of the circuit..and i have to built the circuit in Multisim after i found the exactly components to test it.so the components that i found must be matched with the code of components in multisim,or else it cant be use.

1) Anybody can tell me what exactly are they for those components?
2) Now i roughly know the second component is a ttl(7486N),and the third component(from the left) is octal 3-state buffer(DM74LS244),and the first one is an op-amp..Is it correct?
3) How large of capacitance for the polar-capacitor for this circuit roughly?
4) Where can i get the input for NIM?
5) Anybody can tell me what is NIM signals and TTL signals?

THANK YOU^^

Answer 1

1) The 51 Ohm resistor is a load resistor for the input signal (which is supposed to be propagated on a 50 Ohm transmission line). The 10H125 is an ECL to TTL translator. It is a very fast comparator. The positive input is biased so that the ECL levels are shifted slightly closer to NIM levels. The output of the comparator is a positive voltage at TTL levels. The 74F86 acts as a switchable inverter (the 10H125 inverts the signal), and can either invert or not invert the signal from the 10H125. The 74F244 is a driver, to drive the TTL signal to multiple devices if necessary. It may be tri-stated, but that function is permanently off by tying pin 1 to GND.

2) The component of the left of Figure 5 is a 10H125 ECL-to-TTL translator:
http://www.onsemi.com/PowerSolutions/product.do?id=MC10H125
The other components you have identified correctly, however they should be FAST components (a TTL family type 'F', not a description of how rapidly they work). If you cannot find a 74F86 and/or 74F244, then you may substitute the HCT family (74HCT86, 74HCT244). For the output buffer, any non-inverting driver will do: 126, 244, 544, etc.)

3) The capacitor value is dependant on the stability and noise of your -6 V power supply. If there is a lot of ripple on the -6V power supply, then the capacitor should probably be 1 to 10 uF, otherwise 0.1 uF should be sufficient.

4) The quickest way to simulate a NIM input is to use a signal generator (square-wave), with a DC offset. Set the DC offset such that the square wave output (into 50 Ohm load) is -1.2V to 0V peak-to-peak voltage.

5) NIM stands for Nuclear Instrumentation Module. It is an electrical and mechanical specification for electronic modules first standardised in the 1960s. TTL stands for Transistor-to-Transistor logic -- another standard from the 1960s specifically for logic devices.

NIM signals are close enough to ECL (emitter coupled logic) logic levels that ECL translators may be biased (as in Figure 5) to accept NIM signals.

Back in the 1960s through the mid-1970s the fastest logic integrated circuits were ECL, using negative power supply voltages.
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Answer 2

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