PRL-430N Pulse Research Lab Dual Channel Differential NECL Receiver

The Pulse Research Lab PRL-430N/430P Dual Channel Differential NECL/PECL Receivers are respectively dual channel, differential or single-ended input NECL and PECL receiver modules with complementary outputs. They are intended for converting single-ended signals, including GHz sine waves, into differential NECL/PECL signals for driving long lines and for receiving differential signals from long lines.

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/VTT, where VTT is equal to -2 V for NECL and +3 V for PECL. In the differential input mode, 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 for NECL and +3.7 V for PECL, and termination resistors R_T's for the D input channels are changed to 62 Ω. Complementary outputs of both models are designed for driving 50 Ω loads terminated into VTT or AC coupled 50 Ω loads.

Either output from the PRL-430N can drive a single-ended NECL input. The PRL-430P complementary outputs, however, must be used together for driving differential PECL inputs only, because the reduced output logic swing of 400 m V_p-p, due to short circuit protection reasons, is not logic level compatible with single-ended PECL input.