PRL-550ND4X and PRL-550PD4X 

Dual Channel ECL/PECL Terminators

Basic Lab Tools > ECL/PECL Terminators > PRL-550

Applications:

• Allow direct connection of ECL/PECL signals to 50W input instruments

• Provide standard 50W /V_TT terminations for ECL/PECL signals and Ground Referenced Outputs

• Testing and monitoring GHz ECL/PECL signals in digital and wireless communication applications

Features:

• 43ps Typical Rise Time (8 GHz bandwidth)

• 50W /-2V Input Termination for ECL and 50W /3V for PECL

• Ground Referenced Outputs protect sensitive instruments

• SMA I/O connectors

• 4X attenuation

• Self-contained 1.3 x 2.9 x 1.5-in. unit includes a ± 8.5V AC/DC Adapter

Description

ECL/PECL logic levels are offset from ground. Without proper level shifting, these logic signals can not be connected to ground referenced 50W input instruments, such as sampling 'scopes, network analyzers, scanners and counters, etc. Otherwise, either the ECL/PECL equipment outputs or the measurement instrument inputs may be made inoperative or damaged.

When driving a length of 50W coaxial cable, an ECL/PECL output must be terminated into a 50W load that is connected to a terminating voltage V_TT = V_CC -2V. For ECL circuits operating with a supply voltage of either -5.2V or -4.5V, V_CC is 0V, and V_TT is equal to -2V. For PECL circuits, where the supply voltage V_CC is +5V, V_TT is +3V.

ECL/PECL Terminators are level translators which convert ECL/PECL signals into signals that can be connected to ground referenced 50W input instruments and, at the same time, provide standard 50W /V_TT terminations required by ECL/PECL signals.

The PRL-550ND4X and PRL-550PD4X are, respectively, Dual Channel ECL and PECL Terminators. The PRL-550ND4X is designed to interface with ECL circuits operating with a -5.2V or -4.5V supply. Each input has an equivalent 50W resistor terminated to a voltage V_TT = -2V. 

The PRL-550PQ4X is designed to interface with PECL circuits operating with a +5V supply. Each input has an equivalent 50W resistor terminated to a voltage V_TT = +3V. The outputs of these Terminators are designed for direct connection to ground referenced 50W input instruments as shown in Figs. 1 and 2, respectively. These near ground level output signals* protect sensitive instruments and enhance measurement accuracy when these instruments are used.

Once an ECL or PECL signal is translated through a proper Terminator, it can be routed through 50W scanners and other high frequency measuring instruments for processing. Each PRL-550NQ4X and PRL-550PQ4X Terminator is housed in an attractive 1.3 x 2.9 x 2.2-in. extruded aluminum enclosure and is supplied with a ± 8.5V AC/DC Adapter.

Fig. 1 ECL driving a 50W input instrument using the PRL-550ND4X Terminator

Fig. 2 PECL driving a 50W input instrument using the PRL-550PD4X Terminator