2 Ch. Universal Differential Receiver, NECL Outputs


$ 1,229.35


  • Differential LVDS, RS422, LVPECL, NECL, PECL or TTL to NECL Logic Level Translation
  • Differential line driver/receiver
  • Essential Lab Tools for interfacing with High Speed Data Communications Equipment


  • 1.5 GHz Maximum Toggle Rate
  • Floating 100 Ω Universal Differential Inputs Accept LVDS, LVPECL, NECL, PECL, RS422 or TTL Inputs
  • Complementary 50 Ω NECL
  • Ready-to-Use 1.3 x 2.9 x 3.9-in. Modules include a ±8.5 V/1.8 A AC/DC Adapter


The PRL-425N is a dual channel, universal input, differential receivers with NECL outputs. The floating 100 Ω inputs are designed for interfacing with differential signals within the common mode range of -2.4 V to +4.0 V. Therefore, they are compatible with LVDS, RS422, LVPECL, LVTTL/CMOS, NECL, PECL or TTL differential input signals. The PRL-425N has complementary NECL outputs for driving 50 Ω loads terminated to -2 V, floating 100 Ω loads or AC-coupled 50 Ω loads. It is also a long line driver, designed specifically for use with high speed data communications applications. Functional block diagrams of these devices are shown in Fig. 1 and Fig. 2. Model numbers with suffix TR, such as PRL-425NTR, have Triax input connectors instead of SMA input connectors.

The PRL-425N is housed in a 1.3 x 2.9 x 3.9-in. extruded aluminum enclosure, and each is provided with a ±8.5 V AC/DC Adapter. Optional mounting brackets are available.

Fig. 1, PRL-425N Dual Ch. Universal Receiver (SMA) with NECL Outputs
Fig. 2, PRL-425NTR Dual Ch. Universal Receiver (Triax) with NECL Outputs

(0° C ≤ TA ≤ 35° C)*

Symbol Parameter PRL-425N UNIT Notes
Min Typ Max
RinD Differential Input Resistance 95 100 105 Ω  
RinC Common Mode Input Resistance   5K   Ω  
IDC1 DC Input Current, +8.5 V   30 40 mA  
IDC2 DC Input Current, -8.5 V   -130 -150 mA  
VDC DC Input Voltage ±7.5 ±8.5 ±12 V  
VAC AC/DC Adapter Input Voltage 103 115 127 V  
VOHNL Output Hi Level, No Load   -0.85   V 50 Ω/-2 V
VOHFL Output Hi Level, Full Load -1.05 -0.95 -0.75 V  
VOLNL Output Lo Level, No Load   -1.65   V 50 Ω/-2 V
VOLFL Output Lo Level, Full Load -1.95 -1.75 -1.6 V  
tPLH Propagation Delay to output ↑   1500   ps  
tPHL Propagation Delay to output ↓   1500   ps  
tr/tf Rise/Fall Times1 (20%-80%)   500 850 ps  
fMAX1 Maximum Clock Frequency SMA2 1500 1800   MHz  
fMAX2 Maximum Clock Frequency Triax3 500 625   MHz  
tSKEW1 Skew between outputs   50 200 ps  
tSKEW2 Skew from unit to unit   100 400 ps  
VCM Input Common Mode Voltage -2.4   +4.0 V  
  Size 1.3 x 2.9 x 3.9  in.  
  Weight, w/o AC adapter 7 Oz  
  Shipping weight, w/AC adapter 4 lb.  


(1). The NECL 50 Ω output rise and fall times (20%-80%) are measured with both the Q and Q outputs terminated into 50 Ω/-2 V. If one output is not terminated, both the rise and fall times will increase by approximately 15%, and output waveform degradation will occur. The TTL outputs rise and fall times (10%-90%) are measured with ground referenced 50 Ω terminations, and it is not necessary to terminate an unused output.

(2). fMAX I is measured by dividing the outputs by four, using the PRL-255N, ÷2 and ÷4 frequency divider module, and then measured using the PRL-550NQ4X, four channel ECL Terminators, connected to a sampling 'scope.

(3) Units with the Trompeter CBBJR79 Triax input connectors are tested using the PRL-433N, complementary NECL input to Differential NECL output translator, and the Trompeter PCGOW10PCG-36 shielded twisted pair cables. Specified fmax is limited to 625 MHz due to test equipment limitations, not due to any inherent limitation in the Triax connector

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: