PRL-444LV, 4 Channel TTL/CMOS to LVDS Level Translator and Line Driver


$ 1,075.00


  • TTL to LVDS Logic Level Translation
  • Conversion of Single-Ended TTL Signals to Differential Signals for Driving Long Lines
  • Mini Modular Instrument for interfacing with High Speed Data Communications Equipment


  • 250 MHz Typical Maximum Clock Rate
  • 4 Single Ended Inputs with Selectable 50 Ω or 1 kΩ Termination
  • 4 LVDS Outputs for Driving 50 Ohm or Cat 7 Cables into 100 Ω Floating Loads
  • SMA or RJ45 I/O Connectors
  • Single Supply, +7.5 VDC to +12 VDC, operation
  • Ready-to-Use 1.3 x 2.9 x 2.9-in. Module includes a ±8.5 V/1.4 A AC/DC Adapter


The PRL-444LV is a 4 Channel TTL to LVDS translator module. The input resistance of the inputs can be selected to be either 50 Ω or 1 kΩ by a common toggle switch. The 1 kΩ inputs are desirable when interfacing with low power circuits. The four pairs of complementary outputs are designed for driving floating 100 Ω loads, normally the configuration used in LVDS input circuits. The output swing is typically 300 mV with a common mode voltage of 1.0 V.

All I/Os are DC coupled and have SMA or RJ45 connectors, as part numbers PRL-444LV-SMA and PRL-444LV-RJRJ, respectively. A block diagram showing the equivalent input and output circuits are shown in Figs. 1 and 2. Cat7 or better cabling is recommended for RJ45 models, as the double shielding improves the impedance control. See our case studies on single-ended impedance and differential impedance of standard, off-the-shelf network cabling. 

The modules are housed in a 1.3 x 2.9 x 2.9-in. extruded aluminum enclosure and supplied with a ±8.5 V/±1.4 A, auto-switching AC/DC Adapter. Either model may also be ordered without the power supply by appending “-OEM” to the part number, e.g. PRL-444LV-SMA-OEM. A maximum of four units can share one PRL-760D-120/220 AC/DC adapter, using additional units of cable #88000102-4. If mounting is desired, a pair of the #35001420 mounting brackets can accommodate any two PRL modules of the same length. Please refer to the Accessories section for more detail.

A complementary product, the PRL-425QLT, performs the opposite conversion of 4 LVDS signals to 4 TTL signals, and the PRL-RJ45-SMA adapter can be used to adapt Cat7 network cabling to SMA or the reverse.

Fig. 1: PRL-444LV-SMA Block Diagram
Fig. 2: PRL-444LV-RJRJ Block Diagram

SPECIFICATIONS: (0° C ≤ TA ≤ 35° C)*

RIN1 Input Resistance 49.5 50.0 50.5 Ω  
RIN2 Input Resistance 990 1000 1010 V  
VIL TTL input Low Level -0.5 0.0 0.5 V  
VIH TTL input High Level 2.0 2.4 5.0 V  
VDC DC Input Voltage 7.5 8.5 12.0 V  
VAC1 AC/DC Adapter Input Voltage, 120 103 115 127 V  
VAC1 AC/DC Adapter Input Voltage, 220 206 230 254 V  
IDC1 DC Input Current @ 50 MHz 65 85 mA  
IDC2 DC Input Current @ 250 MHz 125 mA  
VOPP Output Differential Voltage, peak-to-peak 250 300 450 mV  
VCMO Output Common mode voltage1 1.0 1.2 V  
tPLH Propagation Delay to output ↑ 2 3 ns  
tPHL Propagation Delay to output ↓ 2 3 ns  
tr/tf1 Rise/Fall Times (10%-90%)1 1.0 1.8 ns Note 1
fMAX Max Clock Frequency 200 250   MHz Note 1
tSKEW Skew between any 2 outputs 300 750 ps  
DTY Duty Cycle @ 50 MHz 45/55
  Size 1.3 x 2.9 x 2.9 in.  
  Weight 5 Oz  
  Shipping Weight 3
1-SMA model only. fmax and tr/tf for RJ45 models are pending.

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