2 Ch. Translator, 50 Ohm NECL to 124 Ohm NECL


$ 1,472.00


  • Extends the maximum range of the Sony DFC-1800 Variable Rate Buffer to 200 feet
  • Also used for Metrum 64 Playback and Record Adapter


  • GHz 100k ECLinPS Technology
  • 600 MHz maximum clock rate
  • Single-ended or differential 50 Ω/-2V input terminations
  • Differential 124 Ω outputs
  • Ready-to-use 1.3" x 2.9" x 3.9" module, including a ±8.5 V AC/DC adapter


The 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.
  1. 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.
  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 eight, using the PRL-255, and then measured using the PRL-550NQ4X, four channel ECL Terminator, connected to a sampling 'scope.
  3. Trompeter P/N CBBJR79.
  4. 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.
  5. 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.