2 Ch. NCML to LVPECL Level Translator


$ 718.75


  • Converting Differential NCML Inputs to Differential LVPECL Outputs
  • High Speed Digital Communications System Testing
  • Satellite/Radar/Telecommunications System Integration


  • fMAX > 1.5 GHz
  • 650 ps tr
  • 50 Ω NCML Input Termination
  • Complementary LVPECL Outputs
  • DC Coupled SMA I/O Connectors
  • Self-contained 1.3H x 2.9W x 3.9D unit includes AC/DC adapter


The PRL-429LP is a 2-channel NCML to differential LVPECL Logic Level Translator module. Each channel has a differential NCML input and a differential LVPECL output. The LVPECL DC output logic Hi/Lo levels are 2.20 V and 1.75 V, respectively, when terminated to 50 Ω/+1.3 V loads.

The PRL-429LP complementary outputs must be used together for driving differential LVPECL inputs only, because the reduced output logic swing of 400 mVPP (for short circuit protection reasons) is not logic level compatible with some single-ended LVPECL inputs.

These Logic Level Translators are designed specifically for use in testing and interfacing of high speed digital communications circuits, where conversion between NCML and LVPECL logic signals is often required. The PRL-429LP is part of the Mini Modular Instrument™ (MMI) family that find increasing applications in high speed digital data recording instruments, transient recording instruments and other high speed measurement equipment where NCML and LVPECL signals are often specified.

Fig. 1 PRL-429LP Block Diagram

(0° C ≤ TA ≤ 35° C)*

Unless otherwise specified, all logic level and dynamic measurements are made with all outputs terminated into 50 Ω/VTT, where VTT = 0 V for LVPECL outputs.

Min Typ Max
RIN Input Resistance 49.5 50.0 50.5 Ω
ROUT Output Resistance 49.5 50.5 50.5 Ω
VIL Input Lo Voltage V
VIH Input Hi Voltage V
VOL DC Output Low Level, into 50 Ω/+1.3 V 1.75 V
VOH DC Output High Level, into 50 Ω/+1.3 V 2.20 V
VOPP1 Output Logic Swing from DC-500MHz mV
VOPP2 Output Logic Swing from 500MHz-1GHz mV
VOPP3 Output Logic Swing from 1GHz -1.5GHz mV
IDC1 DC Input Current, +8.5 V 160 mA
IDC2 DC Input Current, -8.5 V -315 mA
VDC DC Input Voltage ±7.5 ±8.5 ±12.0 V
VAC AC/DC Adapter Input Voltage 108 120 132 V
tPLH Propagation Delay to output ↑ 1.5   ns
tPHL Propagation Delay to output ↓ 1.5   ns
tR/tF Rise/Fall Times (10-90%)   650 750 ps
TSKEW Skew between any 2 outputs 40 75 ps
VINI Minimum Input Voltage @ 150 MHz 20 10 mVpp
VINII Minimum Input Voltage @ 250 MHz 20 10 mVpp
fMAX Max Clock Frequency 1250 1500 MHz
  Size 1.3H x 2.9W x 3.9D in.
  Weight, excluding AC adapter 7 Oz
  Shipping weight, including AC adapter 4 lb.
For the PRL-429LP, very slight output waveform distortion and rise time degradation will occur when an unused complementary output is not terminated. For optimum performance, however, all outputs should be terminated.