2 Channel Comparator, RS-422 Outputs

SKU:

$ 1,397.25

Quantity

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
RS-422 Translation

Features:

f_MAX > 500 MHz
1.1ns 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 @ 100 MHz.
DC Coupled 50 Ω Inputs
Differential 124 Ω Outputs
SMA inputs with SMA or Triax Output Connectors
Self-contained 1.3 x 2.9 x 3.9-in. unit includes AC/DC Adapter

Description

The PRL-350RS is a ready-to-use, high-speed, dual-channel comparator module with RS-422 outputs. The PRL-350RS has a typical maximum clock frequency in excess of 500 MHz and has differential RS-422 outputs designed for driving floating 124 Ω transmission lines.

The PRL-350RS has DC-coupled 50 Ω inputs and differential 124 Ω 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, or varied independently for each channel by applying a DC bias voltage to one of the two inputs. 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-350RS-NIM (special order), 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, sinewave-to-square wave converters, window comparators or differential line receivers, etc. The typical minimum input voltage of 10 mV_PP is required for up to 100 MHz. It is recommended that the non-driven input be terminated into 50 Ω when the input frequency is near f_MAX and its amplitude is less than 20 mV_PP.

The PRL-350RS model has SMA input and output connectors. The PRL-350RSTR has SMA inputs and Triax output connectors. Each unit is supplied with a ±8.5 V AC/DC Adapter and housed in a 1.3 x 2.9 x 3.9-in. extruded aluminum enclosure

Fig. 1D PRL-350RS Block Diagram

Fig. 1E PRL-350RSTR Block Diagram

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 ≤ T_A ≤ 35° C)*

Unless otherwise specified, dynamic measurements are made with all outputs terminated into 50 Ω/V_TT, where V_TT = +3 V for PECL outputs.

Symbol	Parameter	PRL-350RS			Unit
Symbol	Parameter	Min	Typ	Max	Unit
R_IN	Input Resistance	49.5	50	50.5	Ω
R_OUT	Output Resistance	123	124	125	Ω
V_TH+	Preset positive threshold voltage	45	50	55	mV
V_TH-	Preset negative threshold voltage	-55	-50	-45	mV
V_TH0	Preset zero threshold voltage⁽¹⁾	-10	0	10	mV
V_OLNL	Output Low Level, No Load	-1.2	-1.0	-0.8	V
V_OLFL	Output Low Level, 124 Ω Load	-0.2	0	0.2	V
V_OHNL	Output High Level, No Load	2.75	3.0	3.3	V
V_OHFL	Output High Level, 124 Ω Load	1.8	2.0	2.2	V
I_DC1	DC Input Current, +8.5 V		165	175	mA
I_DC2	DC Input Current, -8.5 V		-235	-250	mA
V_DC	DC Input Voltage	±7.5	±8.5	±12	V
V_AC	AC/DC Adapter Input Voltage	103	115	127	V
t_PLH	Propagation Delay to output↑		2		ns
t_PHL	Propagation Delay to output↓		2		ns
t_r/t_f	Rise/Fall Times⁽²⁾		1100	1250	ps
t_SKEW	Skew between any 2 outputs		200	400	ps
V_in I	Minimum Input Voltage @ 150 MHz⁽¹⁾	20	10		mV_PP
V_in II	Minimum Input Voltage @ 250 MHz⁽¹⁾	40	20		mV_PP
V_CM	Input Common Mode Range	-2.0		+3.0	V
f_max	Max. Clock Frequency	500	550		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) 10%-90% for RS-422.