2 Ch. Translator, LVPECL to NECL, 1.25 GHz

Applications:

• Converting Single Ended or Differential LVPECL Signals to Differential NECL Signals
• High Speed Digital Communications systems Testing
• High Speed SONET Clock Level Translation

Features:

• f_MAX > 1.25 GHz
• 750 ps t_r
• 50 Ω/V_TT Input Terminations
• Single Ended or Differential Inputs
• Complementary NECL Outputs drive 50 Ω/-2V Terminations, AC-coupled or Floating 50 Ω Loads
• DC coupled I/Os with SMA Connectors
• Self-contained 1.3 x 2.9 x 2.9-in. unit including an AC/DC Adapter

Description

The PRL-460ALPND is a dual channel LVPECL to NECL Logic Level Translator module, intended for operation from DC to the GHz range. Maximum clock frequency is typically 1.5 GHz. These modules can receive either single-ended or differential input signals, to be selected by a switch.

The complementary outputs of these modules are designed for driving 50 Ω loads terminated to -2 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 LVPECL to NECL logic families is often required.

The PRL-460ALPND inputs are designed to interface with LVPECL circuits operating with a +3.3 V supply. In the differential input mode, both inputs D and D are terminated into 50 Ω/V_TT, where V_TT is +1.3V for LVPECL. 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 V_BB, nominally +2 V for LVPECL, and termination resistors R_T for the D input channels are changed to 62 Ω. A block diagram of the PRL-460ALPND is shown in Fig. 1.

The PRL-460ALPND is 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.