8-Channel Differential ECL/PECL to TTL Convertor for Logic Analyzers or Scopes, US $32.50 – Picture 0

8-Channel Differential ECL/PECL to TTL Convertor for Logic Analyzers or Scopes, US $32.50 – Picture 1

8-channel Differential Ecl/pecl To Ttl Convertor For Logic Analyzers Or Scopes

US $32.50

Chapin, South Carolina, United States
Jan 29th

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The differential convertor was manufactured by Dragonfly Software, now a part of the Moving Pixel Company, which is a Tektronix Embedded System Tools Partner that makes software and hardware that extend the capabilities of Tek instrumentation. This auction is for quantity one ECL-A8 differential convertor including twisted pairs leadset. The photo is a stock picture which is representative of the actual unit being auctioned. Typical logic analyzer probes can be disruptive when connected to high-speed differential transmission lines. This is particularly true when a single-ended logic analyzer input is connected to only 1/2 of the differential pair. This differential convertor is designed to allow probing of high-speed differential transmission lines with minimal impact on signal integrity by allowing you to use optimum termination resistor values and by probing both halves of the differential pair at the same time. These are especially useful when used with higher capacitance probes such as 40-pin cable probes used by quite a few Hewlett Packard (HP) or Agilent logic analyzers (16500, 16800, etc.). All of the 40-pin cable probes have 8pF capacitive loading. The following information is from the manufacturer: The differential convertor was designed with the design engineer in mind. The idea is that one logic analyzer probe does not fit all and YOU might want to modify a probe to better fit your needs. The convertor's circuit board uses one ounce copper so that a user can repeatedly solder in different termination sets without damage/pad lifting. Each differential convertor converts eight (8) differential Emitter-Coupled Logic (ECL) inputs, or eight (8) differential Positive Emitter-Coupled Logic (PECL) inputs to a eight (8) single-ended TTL outputs. They draw their power from separate wires connected to the system under test. ECL Differential Differential Convertor Usage Hints The Differential ECL/PECL differential convertor is useful to convert differential signals to single-ended signals for a logic analyzer or scope. If the differential convertor is powered up, there is a faint green light visible through the front (where the leadset is connected). The differential convertor also has reverse power connection protection via a parallel reverse diode and polymer fuse (self-resetting). In systems where the power supply cannot supply more than 1.5 amps continuous current to the differential convertor, the reverse protection will pull the supply down. Powering the Differential Convertor The ECL differential convertor can be used for both PECL and standard ECL systems. PECL is powered from +5.0V and standard ECL is powered from -5.2V. In a PECL system, the "V-" lead from the differential convertor should be connected to 0 volts (system ground). The "V+" lead from the differential convertor should be connected to the +5 volt power supply. The "Ground" lead from the back of the differential convertor should also be connected to 0 volts to provide a ground for the logic analyzer (or scope) ground reference. In PECL systems, a logic high is about 0.8 volts below the V+ lead; a logic low is about 1.8 volts below the V+ lead. In an ECL system, the "V-" lead from the differential convertor should be connected to -5.2 volt supply. The "V+" lead from thee differential convertor should be connected to 0 volts (system ground). The "Ground" lead from the back of the differential convertor should also be connected to 0 volts to provide a ground for the logic analyzer (or scope) ground reference. In ECL systems, a logic high is about 0.8 volts below the V+ lead; a logic low is about 1.8 volts below the V+ lead. As can be seen from the two examples above, as long as the "V+" lead is connected to the most positive supply, the "V-" lead is connected to the most negative supply, the "Ground" lead is connected to the system ground, and the logic analyzer (or scope) is adjusted to respond to the correct threshold level (midway between the logic high and the logic low for a given configuration), the differential convertor should provide a differential to single-ended conversion. Terminating the Differential Convertor The differential convertor provides for several different types of termination method. We invite the user of the differential convertor to open the unit and adjust the termination method as is appropriate for their needs. The resistor type is the common 0603 package. Some termination possibilities are outlined below. The differential convertor is shipped without any terminations installed. The most common termination method is no termination on the differential convertor using a short lead set. This works well in low speed (slow risetime) systems that can tolerate some stub. However, there are many applications where this in not acceptable. Another method is to remove the differential termination in the system under test, attach the leadset, and add the differential termination in the differential convertor. The differential convertor also provides the user with the ability to setup individual parallel terminations on every line. This also makes it possible to setup individual channel biases for single-ended level translation. Check out my other items!

Condition	Used : An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections.
Seller Notes	“In excellent condition. This was a Tektronix sales demo and is essentially unused.”