2 Channel Comparator, NECL Outputs, NIM-Compatible Inputs

SKU:

$ 1,397.25

Applications:

  • Window Comparators
  • High Speed Timing
  • Line Receivers
  • Threshold Detection
  • Peak Detection
  • PON Module testing with Anritsu MP1800A

Features:

  • fmax > 1000 MHz
  • 750 ps Typical tr
  • +400 mV, 0 V or -400 mV Preset Input Threshold Voltage
  • -2.0 V to +3.0 V Input Common Mode Range
  • 10 mVPP Minimum Input @ 300 MHz.
  • DC Coupled 50 Ω Inputs
  • Complementary NECL Outputs
  • SMA I/O Connectors
  • Self-contained units include AC/DC Adapters

Description

The PRL-350ECL-NIM is a ready-to-use, high speed dual-channel comparator module. The PRL-350ECL-NIM has a maximum clock frequency in excess of 1 GHz and has complementary NECL outputs designed for driving 50 Ω transmission lines terminated to 50 Ω/-2 V.

Both channels have a DC coupled 50 Ω input. The input threshold voltage can be selected either from a set of preset values of -400 mV, 0 V or +400 mV using a common three-position switch. The input Common Mode Range is -2.0 V to +3.0 V.

The input threshold voltage can also be varied independently in each channel by applying an external DC bias voltage or shunt resistor to the D input.

  • If the external DC bias has a sufficiently low output impedance, it will over-ride the internally-generated VTH, and the toggle switch setting is a don’t-care.
  • For an external shunt resistor, the effective threshold voltage, VTHE, will be the result of the resistor-divider network formed by the external shunt resistor and the internal 50 Ohm termination to the selected VTH.
  • In the following example, the internal VTH is set to +50 mV, and it is pulled down to an effective VTHE of +10 mV via a 12.5 Ω shunt resistor:
  • To prevent oscillation, the external shunt resistor should be placed as close as possible to the D input, e.g. by using the male end of the PRL-PINET-SMF or similar device.

This high speed comparator is a Mini Modular Instrument™ that can be used as peak detector, threshold detector, sine wave to square wave converter, window comparator or differential line receiver, etc. Typical minimum input voltage required at 300 MHz is 10 mVPP into 50 Ω.

Each unit is supplied with a ±8.5 V AC/DC Adapter and housed in an attractive 1.3 x 2.9 x 3.9-in. extruded aluminum enclosure.

* Although the PRL-350ECL-NIM typically operates up to 2 GHz, the internal device is specified at 1 GHz by the device manufacturer; therefore the guaranteed fMAX is 1 GHz.
Fig. 1A PRL-350ECL-NIM Block Diagram

* For the PRL-350ECL-NIM an unused complementary output must be either terminated into 50 Ω/-2 V or AC-coupled into a 50 Ω load; otherwise, output waveform distortion and rise time degradation will occur. Use the PRL-550NQ4X, four channel NECL Terminator for the 50 Ω/-2 V termination and for connection of ECL 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:

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

(0° C ≤ TA ≤ 35° C)*

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

Symbol Parameter PRL-350ECL-NIM Unit
Min Typ Max
RIN Input Resistance 49.5 50 50.5 Ω
ROUT Output Resistance NPN emitter Ω
VTH+ Preset positive threshold voltage 396 400 404 mV
VTH- Preset negative threshold voltage -404 -400 396 mV
VTH0 Preset zero threshold voltage(1) -2 0 2 mV
VOL Output Low Level -2 -1.6 -1.5 V
VOH Output High Level -1 -0.8 -0.6 V
IDC DC Input Current 36/
-136
45/
-145
mA
VDC DC Input Voltage ±7.5 ±8.5 ±12 V
VAC AC/DC Adapter Input Voltage 103 115 127 V
tPLH Propagation Delay to output↑ 1.5 ns
tPHL Propagation Delay to output↓ 1.5 ns
tr/tf Rise/Fall Times(2) 750 850 ps
tSKEW Skew between any 2 outputs 100 300 ps
Vin I Minimum Input Voltage @ 150 MHz(3) 20 10 mVPP
Vin II Minimum Input Voltage @ 250 MHz(3) 20 10 mVPP
Vin III Minimum Input Voltage @ 1 GHz 250 100 mVPP
VCM Input Common Mode Range -2.0/+3.0 V
fmax Max. Clock Frequency(4) 1000 2000 MHz
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) 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 NECL. For the PRL-350ECL-NIM, an unused complementary output must be either terminated into 50 Ω/VTT 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-550NQ4X, four channel NECL Terminator for the 50 Ω/VTT termination and for connection of NECL 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 NECL outputs to 50 Ω input instruments.

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

(4) Although the PRL-350ECL-NIM typically operates up to 2 GHz, the internal device is specified at 1 GHz by the device manufacturer; therefore the guaranteed fMAX is 1 GHz.

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