2 Channel Comparator, LVPECL Outputs

SKU:

$ 1,483.50

Item	Description
88000102-4	Cable, triple voltage, with modular plugs, Length in ft.
88000103-4	Cable, triple voltage, with modular plug and pig tail leads, Length in ft.

Product Description
Diagrams
Applications
Specifications
Documents

Applications:

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

Features:

f_max 300 MHz
1.1 ns Typical t_r
+50 mV, 0 V or -50 mV Preset Input Threshold Voltage
-2.0 V to +3.0 V Input Common Mode Range
10 mV_PP Minimum Input @ 300 MHz.
DC Coupled 50 Ω Inputs
Complementary LVPECL Outputs
SMA I/O Connectors
Self-contained units include AC/DC Adapters

Description

The PRL-350LP is a ready-to-use, high speed dual-channel comparator module. The PRL-350LP has a maximum clock frequency in excess of 300 MHz and has complementary LVPECL outputs designed for driving 50 Ω transmission lines terminated to 50 Ω/+1.3 V.

Both channels have DC coupled 50 Ω inputs and outputs. The 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. 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 V_TH, and the toggle switch setting is a don’t-care.

For an external shunt resistor, the effective threshold voltage, V_THE, will be the result of the resistor-divider network formed by the external shunt resistor and the internal 50 Ohm termination to the selected V_TH.

In the following example, the internal V_THis set to +50 mV, and it is pulled down to an effective V_THEof +10 mV via a 12.5 Ω shunt resistor:

This technique is typically provides a more useful operating range when using the PRL-350LP-NIM, with settable ±400 mV thresholds.
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.

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_PP 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.

Fig. 1 PRL-350LP Block Diagram

*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.

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Symbol	Parameter	PRL-350LP			Unit
Symbol	Parameter	Min	Typ	Max	Unit
R_IN	Input Resistance	49.5	50.0	50.5	Ω
R_OUT	Output Resistance	49.5	50.0	50.5	Ω
V_TH+	Preset positive threshold voltage	49.5	50.0	50.5	mV
V_TH-	Preset negative threshold voltage	-50.5	-50.0	-49.5	mV
V_TH0	Preset zero threshold voltage⁽¹⁾	-10	0	10	mV
V_OL	Output Low Level	1.5	1.7	1.8	V
V_OH	Output High Level	2.3	2.5	2.7	V
I_DC+	DC Input Current, +8.5 VDC		175	200	mA
I_DC-	DC Input Current, -8.5 VDC		-325	-350	mA
V_DC+	DC Input Voltage	+7.5	+8.5	+12	V
V_DC-	DC Input Voltage	-12	-8.5	-7.5	V
V_AC1	AC/DC Adapter Input Voltage, 120 VAC	103	115	127
V_AC2	AC/DC Adapter Input Voltage, 220 VAC	206	230	254
t_PLH	Propagation Delay to output↑		1.8		ns
t_PHL	Propagation Delay to output↓		1.8
t_r/t_f	Rise/Fall Times⁽²⁾		1100	1250	ps
t_SKEW	Skew between any 2 outputs		750	1000	ps
V_in I	Minimum Input Voltage @ 150 MHz⁽³⁾	20	10		mV_PP
V_in II	Minimum Input Voltage @ 250 MHz⁽³⁾	20	10		mV_PP
V_CM	Input Common Mode Range	-2.0		+3.0	V
f_max	Max. Clock Frequency⁽⁴⁾	300	330		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 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: