2 Ch. Translator, PECL to NECL

SKU:

$ 661.25

Applications:

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

Features:

  •  fmax > 1000 MHz
  • 750 ps Typical tr
  • 50 Ω/-2 V Inputs
  • Single Ended or Differential Inputs.
  • Complementary NECL Outputs
  • SMA I/O Connectors
  • Self-contained 1.3 x 2.9 x 3.9-in. unit including AC/DC Adapters

Description

The PRL-460PND is a dual channel PECL to NECL Logic Level Translator. Each unit can receive either single ended or differential input signals, to be selected by a switch. The outputs of the PRL-460PND translators are designed for driving 50 Ω loads terminated to -2 V. These high speed translators facilitate testing and integration of high speed digital communications circuits and systems, where conversion of signals between the PECL to NECL logic families is often required.

The PRL-460PND input is designed to interface with PECL circuits operating with a +5 V supply. In the differential input mode, both inputs D and D of the PRL-460PND are terminated 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. Inputs D are switched internally to VBB, nominally +3.7 V, and termination resistors RT for the D input channels are changed to 62 Ω.

Each unit is supplied with a ±8.5 V AC/DC Adapter and housed in an attractive 1.3 x 2.9 x 3.9-in. extruded aluminum enclosure.

Fig. 1, PRL-460PND Block Diagram

*For the PRL-460PND, an unused complementary output must be either terminated into 50 Ω/-2 V or AC coupled into a 50 Ω load; otherwise, output waveform distortion and rise time degradation will occur. Use the PRL-550NQ4X four channel ECL Terminator for the 50 Ω/-2 V termination and for connection of ECL signals to 50 Ω input oscilloscopes. 

For the PRL-460PND, very slight output waveform distortion and rise time degradation will occur when an unused complementary output is not terminated. For optimum performance, however, all outputs should be terminated.

(0° C ≤ TA ≤ 35° C)*

Symbol Parameter PRL-460PND Unit
Min Typ Max
RIN Input Resistance 49.5 50.0 50.5 Ω
ROUT Output Resistance NPN Emitter Ω
VTT D Input Termination Voltage (fixed) 2.7 3.0 3.3 V
VT1 D Input Termination Voltage 2.7 3.0 3.3 V
VT2 D Input Termination Voltage (variable) 3.33 3.70 4.07 V
VOL Output Low Level -1.8 -1.6 -1.5 V
VOH Output High Level -1.0 -0.8 -0.7 V
IDC1 DC Input Current, +8.5 V   +125 +135 mA
IDC1 DC Input Current, -8.5 V   -130 -145 mA
VDC DC Input Voltage ±7.5 ±8.5 ±12 V
VAC AC/DC Adapter Input Voltage 103 115 127 V
tPLH Propagation Delay to output ↑   1.5   ns
tPHL Propagation Delay to output ↓   1.5   ns
tr/tf Rise/Fall Times (20% - 80%)*   750 850 ps
tSKEW Skew between any 2 outputs   200 500 ps
fmax Max Clock Frequency 1000 2000   MHz
  Size 1.3 x 2.9 x 3.9 in.
  Weight excluding AC adapter 7 Oz
  Shipping weight including AC adapter 4 lb.
*Unless otherwise specified, dynamic measurements are made with all outputs terminated into 50 Ω/VTT, where VTT = –2 V for NECL outputs.
For the PRL-460PND, an unused complementary output must be either terminated into 50 Ω/-2 V or AC coupled into a 50 Ω load; otherwise, output waveform distortion and rise time degradation will occur. Use the PRL-550NQ5X four channel ECL Terminator for the 50 Ω/-2 V termination and for connection of ECL signals to 50 Ω input oscilloscopes.