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DescriptionThe PRL-431LP is a 1:2 Differential Fanout LVPECL Buffer module. It is an essential lab tools for applications where it is necessary to drive two different loads from a single source of single-ended or differential LVPECL signals. It can also be used for converting GHz sine wave signals into differential LVPECL 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/VTT*, 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. The D input is switched internally to VBB**, and termination resistor RT for the D input is changed to 62 Ω. Complementary outputs of the PRL-431LP are designed for driving 50 Ω loads terminated into +1.3 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-431LP complementary outputs must be used together for driving differential LVPECL inputs only, because the reduced output logic swing of 400 mVPP (for short circuit protection reasons) is not logic level compatible with some single-ended LVPECL inputs. The PRL-431LP is housed in a 1.3 x 2.9 x 2.2-in. extruded aluminum enclosure and supplied with a ±8.5 V/1.8 A AC/DC Adapter. VTT is nominally -2.0 V for ECL, +3.0 V for PECL, and +1.3 V for LVPECL. VBB is nominally -1.3 V for ECL, +3.7 V for PECL, and 2.0 V for LVPECL. |