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DescriptionThe PRL-433N is a dual channel NECL Interface Translators designed specifically for use with high speed recording instruments in satellite image transmission applications. The PRL-433N is the Recorder Record Translator. It is especially suited for interfacing with the SONY DFC-1800 Variable Rate Buffer used in the DIR-1000 recording system. The differential inputs of the PRL-433N have SMA connectors. 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. The outputs of the PRL-433N have two triax connectors, and they are designed to interface with the 124 Ω differential Serial Data/Data and Clock/Clock inputs of the SONY DFC-1800. Internal pull-down resistors enable these outputs to drive differential 75 Ω loads as well. The PRL-433N is housed in an attractive 1.3 x 2.9 x 3.9-in. extruded aluminum enclosure and supplied with a ±8.5 V AC/DC Adapter. If mounting is desired, a pair of 35001420 mounting brackets can accommodate two PRL modules of the same length. A number of PRL modules can also share a single ±8.5 V AC/DC adapter using the PRL-730 voltage distribution module. |
PRL-432 Dual Channel 50 Ω ECL to 124 Ω ECL Translator (for Sony DFC-1800 Variable Rate Buffer)
| Symbol | Parameter | PRL-433N | Unit | ||
|---|---|---|---|---|---|
| Min | Typ | Max | |||
| RIN | Input Resistance | 49.5 | 50.0 | 50.5 | Ω |
| VTT | Input Termination Voltage (fixed) | -2.2 | -2.0 | -1.8 | V |
| IDC1 | DC Input Current, +8.5 V | +30 | +45 | mA | |
| IDC2 | DC Input Current, -8.5 V | -250 | -275 | 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 ↑ | 1500 | ps | ||
| TPHL | Propagation Delay to output ↓ | 1500 | ps | ||
| TF/TF | Rise/Fall times (20% -80%) | NA | ps | ||
| FMAX | Max clock frequency | 400 | 600 | MHz | |
| TSKEW1 | Skew between outputs | 20 | 100 | ps | |
| TSKEW2 | Skew from unit to unit | 40 | 400 | ps | |
| Input Connector | SMA | ||||
| Output Connector | Triax3 | ||||
| Input Cables | 50 Ω Coax | ||||
| Output Cables | 124 Ω TP4 | ||||
| Size | 1.3" x 2.9" x 3.9" | In. | |||
| Weight, excluding AC adapter | 7 | Oz | |||
| Shipping weight, including AC adapter | 4 | lb. | |||
*Since the high frequency signals to and from the 124 Ω I/O ports can not be measured easily, the 124 Ω I/O ports of these adapters are first cascaded using shielded twisted pair cables, Trompeter P/N PCGOW10PCG-36 or equivalent. Input signals are applied to the 50 Ω inputs of the PRL-433N, and outputs of the PRL-432N` are terminated into 50 Ω/-2V, using the PRL-550NQ4X, four channel ECL Terminators, connected to a 50 Ω input sampling oscilloscope.
Notes:- The 50 Ω output rise and fall times were measured with both the Q and Q outputs terminated into 50 Ω/-2 V. If either output is left unterminated, both the rise and fall times will increase by approximately 15%, and output waveform degradation will occur.
- 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 eight, using the PRL-255, and then measured using the PRL-550NQ4X, four channel ECL Terminator, connected to a sampling 'scope.
- Trompeter P/N CBBJR79.
- Trompeter PCB4W10PEA-36 cable is recommended for interfacing between the CBBJR79 triax connector in the PRL-432N/433N and the twinax connector in the SONY DFC-1800.
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All PRL products with Triax connectors use Trompeter P/N CBBJR79, Right Angle Circuit Board Bulkhead Jack, 3-lug (Numbered page 10, document page 11 of 142). Any Trompeter 70-series Triax Cable Plug with 3 lugs (e.g. PL75-9, 3-lug) will mate with CBBJR79.
