4 Channel PECL Terminator

Applications:

• Replacement for discontinued HP/Agilent/Keysight 10086A ECL Terminator
• Allow direct connection of PECL signals to 50 Ω input instruments
• Provide standard 50 Ω/V_TT terminations for PECL signals and Ground Referenced Outputs
• Testing and monitoring GHz PECL signals in digital and wireless communication applications
• Monitoring of optical transceiver outputs

Features:

• 43 ps Typical Rise Time (8 GHz equivalent bandwidth)
• 50 Ω/+3 V Input Termination for PECL
• Ground Referenced Outputs protect sensitive instruments
• SMA I/O connectors
• 12 dB (4X) attenuation
• Self-contained 1.3 x 2.9 x 2.2-in. unit includes AC/DC Adapter

Description

INTRODUCTION

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

When driving a length of 50 Ω coaxial cable, a PECL output must be terminated into a 50 Ω load that is connected to a terminating voltage V_TT = V_CC -2 V. For PECL circuits, where the supply voltage V_CC is +5 V, V_TT is +3 V.

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

PRODUCT DESCRIPTION

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

Once a PECL signal is translated through a proper Terminator, it can be routed through 50 Ω scanners and other high frequency measuring instruments for processing. Each 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 ±8.5 V AC/DC Adapter.