2 Ch. LVPECL to LVDS Translator


$ 1,229.35


  • Converting Single Ended or Differential LVPECL Signals to LVDS Signals
  • High Speed Digital Communications systems Testing
  • High Speed SONET Clock Level Translation


  • fmax > 500 MHz for LVPECL input
  • 1.1 ns Typical Output Rise & Fall Times
  • Single Ended or Differential 50 Ω/VTT Inputs
  • Complementary 50 Ω LVDS Outputs
  • SMA I/O Connectors 
  • SMA or Triax Output connectors 
  • Two channels for CLK/DATA translation
  • Self-contained 1.3 x 2.9 x 3.9-in. units include ±8.5 V/1.4 A AC/DC Adapters


The PRL-426 is a series of NECL-, PECL-, LVPECL- or TTL-to-LVDS Logic Level Translators:

  • PRL-426N converts NECL to LVDS
  • PRL-426P converts PECL to LVDS
  • PRL-426LP converts LVPECL to LVDS
  • PRL-426T converts TTL to LVDS

The PRL-426LP can receive either single-ended or differential input signals, selected by a switch.

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. The PRL-426LPTR, has Triax output connectors instead of the SMA connectors. These high speed translators facilitate testing of high speed digital communications circuits where conversion of LVPECL clock and data signals to LVDS level signals is often required.

The PRL-426LP is designed to interface with +3.3 V or +3.0 V LVPECL circuits. In the differential input mode, both inputs D and D of the PRL-426LP are terminated into 50 Ω/+1.3 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. The D inputs are switched internally to VBB, nominally +2.0 V for LVPECL, and termination resistors RT for the D input channels are changed to 62 Ω.

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 for mounting multiple units.

Fig. 1: PRL-426LP Dual Ch. LVPECL to LVDS Translator, SMA Outputs

(0° C ≤ TA ≤ 35° C)*

Symbol Parameter PRL-426LP UNIT
Min Typ Max
Rin Input Resistance 49.5 50 50.5 Ω
Rout Output Resistance 49.5 50 50.5 Ω
VTT "D" Input Termination Voltage (fixed) 1.18 1.30
VT1 "D" Input Termination Voltage (fixed) 1.18 1.30 1.43 V
VT2 "D" Input Termination Voltage (variable) 1.8 2.0
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 V)  

IDC2 DC Input Current (-8.5 V) mA
VDC1 DC Input Voltage (+8.5 V) 7.5 8.5 12.0 V
VDC2 DC Input Voltage (-8.5 V) -12.0 -8.2 -7.5 V
VAC1 AC/DC Adapter Input Voltage (120 VAC) 103 115 127 V
VAC2 AC/DC Adapter Input Voltage (220 VAC) 206 230 254 V
tPLH Propagation Delay to output ↑   2   ns
tPHL Propagation Delay to output ↓   2   ns
tr/tf Rise/Fall Times2 (10%-90%)   1 1.25 ns
tSKEW Skew between any two outputs   200 500 ps
fmax Maximum Clock Frequency 500 625   MHz
  Size  1.3 x 2.9 x 3.9 in.
  Weight 7 Oz


(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) 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 models to be accurate, no representations are made as to accuracy or suitability for any application: