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
ECL 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 input mode, signal should be connected to the D input only. Input
D is switched internally to
VBB, nominally -1.3 V, and termination resistor RT
for the D input channel is
changed to 62 Ω. Complementary outputs of the
PRL-434, with internal pull down resistors, can drive either 50 Ω
loads terminated into -2 V, or AC-coupled or floating 50 Ω
loads.
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/1.4 A AC/DC Adapter.
The PRL-434A is an improved model of the previous PRL-434.
It has faster rise/fall times, a higher fMAX and a redesigned mechanical layout with
all the outputs on the same side of the unit. The PRL-434A is
recommended for all new applications except where the smaller enclosure
size or specific connector orientation of the PRL-434 are
critical.
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