1:4 Differential NECL Fanout Buffer/Line Driver, 3.5 GHz

Applications:

• Fan out Single-ended/Differential NECL Inputs into four pairs of Differential NECL Outputs for driving long lines
• Ideal for receiving signals from long lines
• Fan out GHz Sinewave signals into four pairs of Differential NECL signals
• 1 PPS Distribution/IRIG-B Distribution
• An Essential Lab Tool for Working with NECL Circuits

Features:

• 3.5 GHz typical f_MAX
• Single-ended or Differential Inputs
• Internal 50 Ω/-2 V Input Terminations also accept AC coupled PECL or Sinewave signals
• Complementary Outputs drive 50 Ω loads terminated to -2 V or AC- coupled 50 Ω loads
• DC- Coupled I/Os Compatible with ECLinPS or 100 kH Devices
• SMA I/O Connectors
• Ready-to-Use 1.3 x 2.9 x 2.9-in. module includes AC/DC Adapter

Description

The PRL-434A is a 1:4 Differential NECL Fanout Buffer module. It is intended for fanning out single-ended or differential NECL signals into four pairs of differential outputs. It can also be used for converting AC coupled GHz sinewave or PECL signals into differential NECL signals.

A switch selects either single-ended or differential inputs, as shown in Fig. 1. In the differential input mode, both inputs D and D are terminated internally into 50 Ω/-2 V, and, therefore, either one or both inputs can accept AC coupled signals as well. In the single-ended input mode, signals should be connected to the D inputs only. The D inputs are switched internally to V_BB, nominally -1.3 V, and termination resistors R_T for the D input channels are changed to 62 Ω. Complementary outputs of the PRL-434A are designed for driving 50 Ω loads terminated into -2 V. With internal pull-down resistors these outputs can also be AC coupled for driving 50 Ω loads terminated to ground or to other voltages.

The PRL-434A is housed in a 1.3 x 2.9 x 2.9-in. extruded aluminum enclosure and is supplied with a ±8.5 V/1.8 A AC/DC Adapter.