Description
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DescriptionThe PRL-460PLPD is a dual channel PECL to LVPECL Logic Level Translators. It can receive either single ended or differential input signals, to be selected by a switch. The outputs of the PRL-460PLPD translator is designed for driving 50 Ω loads terminated to +1.3 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 LVPECL logic families is often required. The PRL-460PLPD 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-460PLPD 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-460PLPD Block Diagram
(0° C ≤ TA ≤ 35° C)*
| Symbol | Parameter | PRL-460PLPD | Unit | ||
|---|---|---|---|---|---|
| Min | Typ | Max | |||
| Rin | Input Resistance | 49.5 | 50.0 | 50.5 | Ω |
| Rout | Output Resistance | 49.5 | 50.0 | 50.5 | 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 | 1.5 | 1.7 | 1.8 | V |
| VOH | Output High Level | 2.3 | 2.5 | 2.7 | V |
| IDC1 | DC Input Current, +8.5 V | +250 | mA | ||
| IDC1 | DC Input Current, -8.5 V | -300 | 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 ↑ | 2 | ns | ||
| tPHL | Propagation Delay to output ↓ | 2 | ns | ||
| tr/tf | Rise/Fall Times (20% – 80%)* | 1100 | 1300 | ps | |
| tSKEW | Skew between any 2 outputs | 500 | 1000 | ps | |
| fmax | Max Clock Frequency | 300 | 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 =+1.3 V for LVPECL outputs.
For the PRL-460PLPND, an unused complementary output must be either terminated into 50 Ω/+1.3 V or AC coupled into a 50 Ω load; otherwise, output waveform distortion and rise time degradation will occur. Use the PRL-550LPQ4X four channel LVPECL Terminator for the 50 Ω/+1.3 V termination and for connection of LVPECL signals to 50 Ω input oscilloscopes. For the PRL-460PLPD, 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.
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