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DescriptionThe PRL-430AN is a dual channel, differential/single-ended input NECL receiver module with complementary outputs. It is intended for converting single-ended signals, including GHz sine waves, into differential NECL signals for driving long lines and for receiving differential signals from long lines. A switch selects either single-ended or differential inputs, as shown in Fig. 1. In the differential input mode, both inputs D and D are terminated internally into 50 Ω/-2 V, and, therefore, either one or both inputs can accept AC coupled signals as well. In the single-ended input mode, signals should be connected to the D inputs only. The D inputs are switched internally to VBB, nominally -1.3 V, and termination resistors RT for the D input channels are changed to 62 Ω. Complementary outputs of the PRL-430AN are designed for driving 50 Ω loads terminated into -2 V. With internal pull-down resistors these outputs can also be AC coupled for driving 50 Ω loads terminated to ground or to other voltages. The PRL-430AN is housed in a 1.3 x 2.9 x 2.2-in. extruded aluminum enclosure and supplied with a ±8.5 V/1.8 A AC/DC adapter. |
Fig. 1, PRL-430AN Block Diagram(0° C ≤ TA ≤ 35° C)*
| Symbol | Parameter | PRL-430AN | UNIT | ||
|---|---|---|---|---|---|
| Min | Typ | Max | |||
| Rin | Input Resistance | 49.5 | 50.0 | 50.5 | Ω |
| VTT | D Input Termination Voltage (fixed) | -2.2 | -2.0 | -1.8 | V |
| VT1 | D Input Termination Voltage (variable) | -1.17 | -1.30 | -1.43 | V |
| VT2 | D Input Termination Voltage | -2.2 | -2.0 | -1.8 | V |
| VIL | Input Lo Voltage | -1.95 | -1.60 | -1.48 | V |
| VIH | Input Hi Voltage | -1.13 | -0.90 | -0.81 | V |
| VOL | Output Lo Voltage | -1.95 | -1.70 | -1.48 | V |
| VOH | Output Hi Voltage | -1.13 | -0.90 | -0.81 | V |
| IDC | DC Input Current | -235 | -250 | 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 ↑ | 750 | 950 | ps | |
| TPHL | Propagation Delay to output ↓ | 750 | 950 | ps | |
| tr/tf(1) | Rise/Fall Times (20%-80%) | 250 | ps | ||
| TSKEW | Skew between Q & Q outputs | 20 | 75 | ps | |
| FMAX(2) | Max clock frequency | 4 | GHz | ||
| VCMR | Common Mode Range | -2.7 | -0.4 | V | |
| Size | 1.3 x 2.9 x 2.2 | in. | |||
| Weight, excluding AC adapter | 5 | Oz | |||
| Shipping weight, including AC adapter | 4 | lb. | |||
*All measurements are made with outputs terminated into 50 Ω/VTT, using the PRL-550NQ4X four channel NECL Terminator, connected to a 50 Ω input sampling oscilloscope.
Notes:
(1). The output rise and fall times are measured with both the Q and Q outputs terminated into 50 Ω/VTT. An unused complementary output must be either terminated into 50 Ω/VTT or AC coupled into a 50 Ω; otherwise, output waveform distortion and rise time degradation will occur. Use the PRL-550NQ4X four channel NECL Terminator for the 50 Ω/-2 V termination and for connection of NECL signals to 50 Ω input oscilloscopes.
(2). fMAX is measured by AC coupling a sine wave to the D input using the differential input mode (switch up). The differential outputs are first divided by four, using the PRL-255N, and then measured using the PRL-550NQ4X four channel NECL Terminator, connected to a sampling scope.
