Description
The PRL-450ND and PRL-450PD are, respectively, dual channel ECL and PECL to
TTL Logic Level Translators. Each unit can receive either single ended or
differential input signals, selected by a switch. The outputs of these
translators have 50 Ω back terminations, and,
therefore, they drive 50 Ω terminated or unterminated
lines. These high speed translators facilitate testing of high speed digital
communications circuits, where conversion of ECL and PECL clock and data signals
to TTL level signals is often required.
The PRL-450ND is designed to interface with ECL circuits operating with a
-5.2 V or -4.5 V supply, and The PRL-450PD is designed to interface with PECL
circuits operating with a +5 V supply. In the differential input mode, both
inputs D and Q of the PRL-450ND are
terminated into 50 Ω/-2 V, and those of the PRL-450PD
into 50 Ω/3 V. In this mode, either one or both inputs
can accept AC coupled signals as well. In the single input mode, signals should
be connected to the D inputs only. The Q
inputs are switched internally to VBB, nominally -1.3 V for
the PRL-450ND and 3.7 V for the PRL-450PD, and termination resistors QT's
for the Q input channels are changed
to 62 Ω.
Each unit is supplied with a
±8.5 V AC/DC
Adapter
and housed in an attractive 1.3 x 2.9 x 3.9-in. extruded aluminum enclosure.
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