2 Ch. Translator, NECL to PECL

SKU:

$ 661.25

Applications:

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

Features:

  •  fmax > 1000/300 MHz for PRL-460PND/PRL-460NPD
  • 750 ps/1.1 ns Typical tr for PRL-460PND/PRL-460NPD
  • 50 Ω/-2 V Inputs for PRL-460NPD and 50 Ω/3 V for PRL-460PND
  • Single Ended or Differential Inputs.
  • Complementary ECL/PECL Outputs
  • SMA I/O Connectors
  • Self-contained 1.3 x 2.9 x 3.9-in. units including AC/DC Adapters

Description

The PRL-460NPD and PRL-460PND are, respectively, dual channel ECL to PECL and PECL to ECL Logic Level Translators. Each unit can receive either single ended or differential input signals, to be selected by a switch. The outputs of the PRL-460NPD translators are designed for driving 50 Ω loads terminated to 3 V and those of PRL-460PND to 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 ECL to PECL logic families is often required.

The PRL-460NPD input is designed to interface with ECL circuits operating with a -5.2 V or -4.5 V supply, and 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-460NPD are terminated into 50 Ω/-2 V, and those of the PRL-460PND 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 -1.3 V for the PRL-460NPD and 3.7 V for the PRL-460PND, and termination resistors RT's 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. 1A PRL-460NPD Block Diagram

Fig. 1B 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-460NPD, 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-460NPD PRL-460PND

Unit

Min

Typ

Max

Min

Typ

Max

Rin

Input Resistance

49.5

50

50.5

49.5

50

50.5

Rout

Output Resistance

49.5

50

50.5

NPN emitter

VTT

"D" Input Termination Voltage (fixed)

-2.2

-2

-1.8

2.7

3

3.3

V

VT

"D" Input Termination Voltage (variable)

-1.17/
-2.2

-1.3/
-2

-1.43/
-1.8

3.33/
2.7

3.7/
3

4.07/
3.3

V

VoL

Output Low Level

3.2

3.4

3.5

-1.8

-1.6

-1.5

V

VoH

Output High Level

4

4.2

4.3

-1.0

-0.8

-0.7

V

IDC

DC Input Current

 

170
-430

185
-450

 

125
-130

135
-145

mA

VDC

DC Input Voltage

±7.5

±8.5

±12

±7.5

±8.5

±12

V

VAC

AC/DC Adapter Input Voltage

103

115

127

103

115

127

V

tPLH

Propagation Delay to output ↑

 

2

   

1.5

 

ns

tPHL

Propagation Delay to output ↓

 

2

   

1.5

 

ns

tr/tf

Rise/Fall Times*

 

1100

1300

 

750

850

ps

tSKEW

Skew between any 2 outputs

 

500

1000

 

200

500

ps

fmax

Max Clock Frequency

300

500

 

1000

2000

 

MHz

 

Size

1.3 x 2.9 x 3.9

1.3 x 2.9 x 3.9

in.

 

Weight

7

7

Oz

*Unless otherwise specified, dynamic measurements are made with all outputs terminated into 50 Ω/VTT, where VTT =+3 V for PECL outputs and –2 V for ECL 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. For the PRL-460NPD, 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.