2 Ch. RS422 to LVDS Translator


$ 1,229.35


  • Converting RS-422 Signals to LVDS Signals
  • High Speed Digital Communications systems Testing
  • High Speed SONET Clock Level Translation


  • fmax > 500 MHz
  • 1.1 ns Typical Output Rise & Fall Times
  • Floating 124 Ω RS-422 Inputs
  • Differential 50 Ω LVDS Outputs
  • SMA or Triax I/O Connectors
  • Two channels for CLK/DATA translation
  • Self-contained 1.3 x 2.9 x 3.9-in. unit includes ±8.5 V/1.4 A AC/DC Adapter


The PRL-426RS is an RS-422-to-LVDS Logic Level Translator. 

The inputs of the PRL-422RS consist of two pairs of SMA connectors, each internally terminated with 124 Ω between the two signal pins. The SMA shields are tied to chassis ground. They are designed to interface with the 124 Ω differential Serial Data/Data or Clock/Clock outputs from data communications equipment. Model PRL-426RSTRI has Triax input connectors and SMA output connectors. Model PRL-426RSTR has SMA input connectors and Triax output connectors, and is available by special order.

The differential outputs are 50 Ω back-terminated and are designed for driving floating 100 Ω loads, normally the configuration used in LVDS input circuits. The output swing is typically 600 mV with a common mode voltage of 1.2 V. These high speed translators facilitate testing of high speed digital communications circuits where conversion of RS-422 clock and data signals to LVDS signals is often required.

Each unit is supplied with a ±8.5 V/1.8 A AC/DC Adaptor and housed in a 1.3 x 2.9 x 3.9-in. extruded aluminum enclosure. Available accessories include voltage distribution modules and brackets for mounting multiple units.

Fig. 1 PRL-426RS, Dual Channel RS-422 to LVDS Translator, SMA I/Os
Fig. 2 PRL-426RSTRI, Dual Channel RS-422 to LVDS Translator, Triax Inputs, SMA Outputs

(0° C ≤ TA ≤ 35° C)*

Min Typ Max
RIN Input Resistance 122 124 126 Ω
RINC Common Mode Input Resistance   5k   Ω
VCM Input Common Mode Voltage -2.0   +3.0 V
ROUT Output Resistance 49.5 50.0 50.5 Ω
VOL Output Low Level   0.9   V
VOH Output High Level   1.5   V
VCMV Common mode voltage1   1.2   V
IDC1 DC Input Current, +8.5 VDC   85 100 mA
IDC2 DC Input Current, -8.5 VDC   -265 -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 (10%-90%)2   1.00 1.25 ns
tSKEW Skew between any 2 outputs3   200 500 ps
fMAX Max Clock Frequency4 500 625   MHz
  Size 1.3 x 2.9 x 3.9 in.
  Weight, excluding AC adapter 7 Oz
  Weight, including AC adapter 4 lb.
(1) VCMV = (VoH-VoL)/2 
(2) Rise and Fall times are measured with SMA output connector units only and with ground-referenced 50 Ω loads. 
(3) Skew is measured at the output of a PRL-425N when driven by a PRL-426RS
(4) fmax is measured using a PRL-425N with the corresponding input connectors as the receiver. The NECL outputs of the PRL-425N are measured.
Units with the Trompeter CBBJR79 Triax ouput connectors are tested using the PRL-425NTR, Universal Differential Receiver (Triax) with Differential NECL outputs, and the Trompeter PCGOW10PCG-36 shielded twisted pair cables.
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.

While we believe these model to be accurate, no representations are made as to accuracy or suitability for any application: