PRL-426N/426P/426T Dual Ch. NECL/PECL/TTL to LVDS Translators

Basic Lab Tools > Logic Level Translators > PRL-426

Applications:

• Converting Single Ended or Differential NECL/PECL Signals to LVDS Signals
• Converting TTL signals to LVDS
• High Speed Digital Communications systems Testing
• High Speed SONET Clock Level Translation

Features:

• fmax > 500 MHz for NECL/PECL input, 300 MHz for TTL
• 1.1 ns Typical Output Rise & Fall Times
• Single Ended or Differential 50 Ω/V_TT Inputs (NECL/PECL)
• Switchable 1.5 V/1.0 V input threshold (TTL)
• Complementary 50 Ω LVDS Outputs
• SMA I/O Connectors for NECL/PECL; BNC Inputs for TTL
• Triax Output connectors for PRL-426NTR, PRL-426PTR, and PRL-426TTR
• Two channels for CLK/DATA translation
• Self-contained 1.3 x 2.9 x 3.9-in. units include ±8.5 V/1.4 A AC/DC Adapters

Description:

The PRL-426 is a series of NECL-, PECL- or TTL-to-LVDS Logic Level Translators:

• PRL-426N converts NECL to LVDS
• PRL-426P converts PECL to LVDS
• PRL-426T converts TTL to LVDS.

The PRL-426N/426P can receive either single-ended or differential input signals, selected by a switch. The input connectors on the PRL-426N/426P are SMA.

On the PRL-426T, the input is single-ended only, and the switch controls the input threshold (1.5 V or 1.0 V into 50 Ω). The input connectors on the PRL-426T are BNC.

The differential outputs are 50 Ω back-terminated and are designed for driving floating 100 Ω loads, normally the configuration used in LVDS input circuits. The output swing is typically 600 mV with a common mode voltage of 1.2 V. The PRL-426NTR, PRL-426PTR, and PRL-426TTR have Triax output connectors instead of the SMA connectors. These high speed translators facilitate testing of high speed digital communications circuits where conversion of NECL/PECL clock and data signals to LVDS level signals is often required.

The PRL-426N is designed to interface with -5.2 V or -3.3 V NECL circuits and the PRL-426P with +5 V PECL circuits. In the differential input mode, both inputs D and D of the PRL-426N are terminated into 50 Ω/-2 V, and those of the PRL-426P into 50 Ω/3 V. 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. The D inputs are switched internally to V_BB, nominally -1.3 V for the PRL-426N and 3.7 V for the PRL-426P, and termination resistors R_T's for the D input channels are changed to 62 Ω.

The PRL-426T is designed to interface with TTL circuits. In cases where the signal source cannot drive TTL voltages into 50 Ω, the input threshold switch can be used to change the triggering voltage to 1.0 V.

Each unit is supplied with a ±8.5 V/1.4 A AC/DC Adaptor and housed in a 1.3 x 2.9 x 3.9-in. extruded aluminum enclosure. Available accessories include voltage distribution modules for mounting multiple units.

Detail | Diagrams | Specifications | Datasheet