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Signals from ECL and PECL logic ICs are specified to be terminated into 50 Ω returned to VTT = -2.0V and VTT=+1.3V respectively. Most test instrumentation, including sampling oscilloscopes, have input impedances of 50 Ω returned to ground. This has caused problems for measuring ECL or PECL signals. Our 5620-Series of ECL/PECL Terminators solves this problem. They are DC biased 50 Ω attenuators that provide the proper 50 Ω termination impedance returned to VTT, while at the same time delivering an attenuated and level shifted output signal to 50 Ω ground based instrumentation. The output levels are safe to apply directly to sampling oscilloscopes and they are ideal for testing up to 4 Gb/s ECL/PECL logic.
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