2 Channel Comparator, LVPECL Outputs

*For the PRL-350LP, an unused complementary output must be either terminated into 50 Ω/+1.3 V or AC-coupled into a 50 Ω load; otherwise, output waveform distortion and rise time degradation will occur. 

Use the PRL-550LPQ4X, four channel LVPECL Terminator for the 50 Ω/+1.3 V termination and for connection of LVPECL signals to 50 Ω input oscilloscopes.

Anritsu Application Note for PON Module Testing with Anritsu MP1800A
Signal Quality Analyzer and PRL-350 Series Comparators (1.1 MB PDF)

BERT Level Translation

Anritsu engineers and customers around the world rely on our PRL-350 Series comparators for level conversion when testing Passive Optical Network (PON) modules.

PON module testing often requires converting the -1.0 to 0 V signals output by the MU181020A Pulse Pattern Generator cards to the LVTTL, PECL or LVPECL levels required by many ONU and OLT modules, typically for the Data, Pre-bias, and Reset signals.

Popular models include:

• PRL-350TTL-NIM, Dual Channel Comparator with TTL Outputs
• PRL-350LP-NIM, Dual Channel Comparator with LVPECL Outputs
• PRL-350P, Dual Channel Comparator with PECL Outputs

App Note and block diagram copyright and courtesy of Anritsu Corporation.

(0° C ≤ T_A ≤ 35° C)*

Unless otherwise specified, dynamic measurements are made with all outputs terminated into 50 Ω/VTT, where VTT = -2 V for ECL outputs and 0 V for TTL outputs.

(1) If the switch is set to the center position (0 V threshold) a non-driven channel will oscillate and induce jitter in the driven channel. Connect any output to any input to stop the oscillation.

(2) 20%-80% for LVPECL. For the PRL-350LP, an unused complementary output must be either terminated into 50 Ω/V_TT or AC coupled into a 50 Ω load; otherwise, output waveform distortion and rise time degradation will occur. Use the PRL-ACT-50 Dual Channel AC-Coupled 50 Ω Termination for terminating unused complementary outputs. Use the PRL-550LPQ4X, four channel LVPECL Terminator for the 50 Ω/V_TT termination and for connection of LVPECL signals to 50 Ω input oscilloscopes. If preservation of DC levels is not required, then the PRL-SC-104A, 0.1 µf DC block or a 12 dB AC-coupled attenuator may be used to connect the LVPECL outputs to 50 Ω input instruments.

(3) In order to reduce jitter near f_MAX, terminate the non-driven input into 50 Ω when the input voltage is less than 20 mV_PP.

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