The PRL-350ECL and PRL-350TTL are ready-to-use, high speed dual-channel comparator modules. The PRL-350ECL has a maximum clock frequency in excess of 1 GHz and has complementary ECL outputs designed for driving 50 Ω transmission lines terminated to 50 Ω/-2 V. The PRL-350TTL has a maximum clock frequency in excess of 300 MHz and has complementary TTL outputs designed for driving 50 Ω transmission lines with or without 50 Ω load terminations. The PRL-350P is the PECL version, and the PRL-350LP is the LVPECL version.
Both models have DC coupled 50 Ω inputs and outputs. Input threshold voltage can be selected either from a set of preset values of +50 mV, 0 V or 50 mV using a common three-position switch, or varied independently in each channel by applying a DC voltage to one of the two inputs. Input Common Mode Range is -2.0 V to +3.0 V.
These high speed comparators are Mini Modular Instruments ™ that can be used as peak detectors, threshold detectors, sine wave to square wave converters, window comparators or differential line receivers, etc. Typical minimum input voltage required at 300 MHz is 10 mV p-p. 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 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.
*For the PRL-350ECL, 350P and 350LP, 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 four channel ECL Terminator for the 50 Ω/-2 V termination and for connection of ECL signals to 50 Ω input oscilloscopes. For the PRL-350TTL, 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.
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, Dual Channel Comparator with TTL Outputs
- PRL-350LP, 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 ≤ TA ≤ 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.
|ROUT||Output Resistance||NPN emitter||49.5||50||50.5||Ω|
|VTH+||Preset positive threshold voltage||45||50||55||45||50||55||mV|
|VTH-||Preset negative threshold voltage||-55||-50||-45||-55||-50||-45||mV|
|VTH0||Preset zero threshold voltage(1)||-2||0||2||-2||0||2||mV|
|VOL||Output Low Level||-2||-1.6||-1.5||-0.5||0||0.5||V|
|VOH||Output High Level||-1||-0.8||-0.6||2||2.2||2.4||V|
|IDC||DC Input Current||36/
|VDC||DC Input Voltage||±7.5||±8.5||±12||±7.5||±8.5||±12||V|
|VAC||AC/DC Adapter Input Voltage||103||115||127||103||115||127||V|
|tPLH||Propagation Delay to output↑||1.5||2||ns|
|tPHL||Propagation Delay to output↓||1.5||2||ns|
|tSKEW||Skew between any 2 outputs||100||300||200||400||ps|
|Vin I||Minimum Input Voltage @ 150 MHz(3)||20||10||20||10||mV p-p|
|Vin II||Minimum Input Voltage @ 250 MHz(3)||20||10||40||20||mV p-p|
|Vin III||Minimum Input Voltage @ 1 GHz||250||100||NA||mV p-p|
|VCM||Input Common Mode Range||-2.0/+3.0||-2.0/+3.0||V|
|fmax||Max. Clock Frequency(4)||1000||2000||250||300||MHz|
|Size||1.3 x 2.9 x 3.9||1.3 x 2.9 x 3.9||in.|
(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 ECL, 10%-90% for TTL. For the PRL-350ECL, 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-550NQ/PQ4X, four channel NECL/PECL Terminators, respectively, for the 50 Ω/VTT termination and for connection of NECL/PECL signals to 50 Ω input oscilloscopes. If preservation of DC levels is not required, then the PRL-SC-104, 0.1 µf DC block or the PRL-ACX-12dB 12 dB AC-coupled attenuator may be used to connect the NECL/PECL outputs to 50 Ω input instruments.
For the PRL-350TTL, 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.
(3) In order to reduce jitter near fMAX, terminate the non-driven input into 50 Ω when the input voltage is less than 20 mVP-P.
(4) Although the PRL-350ECL 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.