Description
The PRL-460ANPD and PRL-460ANLPD are a dual channel NECL to PECL and NECL to LVPECL Logic Level Translator modules, respectively, intended for operation from DC to the GHz range. Maximum clock frequency is typically 2.5 GHz.
for the NPD version and 1.5 GHz for the NLPD version. These modules can receive either single-ended or differential input signals, to be selected by a switch, but the complementary outputs must be used together. The short-circuit protection feature limits the output swing to 400
mVP-P into a 50 Ω load, which is PECL/LVPECL compatible only if both outputs are used.
The complementary outputs of the PRL-460ANPD are designed for driving 50 Ω loads terminated to +3 V, and they can also drive AC coupled or floating 50 Ω loads. The complementary outputs of the PRL-460ANLPD are designed for driving 50 Ω loads terminated to +1.3 V, and they can also drive AC coupled or floating 50 Ω loads. These high speed translator modules facilitate testing and integration of high speed digital communications circuits and systems, where conversion of signals from NECL to PECL or LVPECL logic families is often required.
The PRL-460ANPD and PRL-460ANLPD inputs are designed to interface with NECL circuits operating with a -5.2 V or -3.3 V supply. In the differential input mode, both inputs D and
D are terminated into 50 Ω/-2 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. Inputs
D are switched internally to VBB, nominally -1.3
V, and termination resistors RT's for the
D input channels are changed to 62 Ω. Block diagrams of the PRL-460ANPD and PRL-460ANLPD are shown in
Figs. 1A and 1B.
The PRL-460ANPD and PRL-460ANLPD are each supplied with a
±8.5 V AC/DC Adapter and housed in a 1.3 x 2.9 x 2.9-in. extruded aluminum enclosure.
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