PRL-422NECL/RS Dual Channel NECL to RS-422 and RS-422 to NECL Translators

Basic Lab Tools > Logic Level Translators > PRL-422

Applications:

• Essential tool for interfacing with High speed data communications equipment
• PRL-422NECL converts single-ended or differential 50 Ω SMA NECL inputs to differential 124 Ω RS-422 Triax outputs
• PRL-422RS converts differential 124 Ω RS-422 Triax Inputs to differential 50 Ω SMA NECL outputs

Features:

• 400 MHz maximum Clock Rate
• Internal Single Ended or Differential 50 Ω/-2 V Input terminations for PRL-422NECL 
• Differential 124 Ω Input terminations for PRL-422RS
• Complementary 50 Ω NECL Outputs for PRL-422RS.
• Differential 124 Ω RS-422 Outputs for PRL-422NECL
• Ready-to-Use 1.3 x 2.9 x 3.9-in. modules, include AC/DC Adapters

Description:

The PRL-422NECL and PRL-422RS are a pair of dual channel, high speed logic level translators. They are 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. The PRL-422RS converts differential 124 Ω RS422 inputs to differential 50 Ω NECL outputs. Functional block diagrams of these devices are shown in Fig. 1 and Fig. 2.

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 V_BB, nominally -1.3 V, and termination resistors R_T'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 inputs of the PRL-422RS consist of two triax connectors, each internally terminated with 124 Ω between the pin and the ring. They are designed to interface with the 124 Ω differential Serial Data/Data or Clock/Clock outputs from the data communications equipment. 

The complementary NECL outputs have SMA connectors. They are designed for driving 50 Ω loads terminated to -2 V, and with internal pull-down resistors, they can be AC-coupled to ground-referenced 50 Ω loads as well.

The PRL-422NECL and PRL-422RS are each 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/1.4 A AC/DC Adapter.

Detail | Specifications | Diagrams | Datasheet