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DescriptionThe PRL-422NECL is a dual channel, high speed logic level translator designed specifically for use with high speed data communications applications. The PRL-422NECL converts single ended or differential 50 Ω NECL inputs to differential 124 Ω RS422 outputs. A functional block diagram is shown in Fig. 1. The differential inputs of the PRL-422NECL have SMA connectors. A switch selects either single-ended or differential inputs. 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, signals should be connected to the D inputs only. The D inputs are switched internally to VBB, nominally -1.3 V, and termination resistors RT's for the D input channels are changed to 62 Ω. The outputs of the PRL-422NECL have two triax connectors, and they are designed to interface with the 124 Ω differential Serial Data/Data or Clock/Clock inputs of the data communications equipment. Internal pull-down resistors enable these outputs to drive differential 75 Ω loads as well. The PRL-422NECL is housed in an attractive 1.3 x 2.9 x 3.9-in. extruded aluminum enclosure. Optional mounting brackets are available. Each unit is supplied with a ±8.5 V/1.8 A AC/DC Adapter. |