1:4 Differential NECL Fanout Buffer/Line Driver, 3.5 GHz

SKU:

$ 1,614.60

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:

Fan out Single-ended/Differential NECL Inputs into four pairs of Differential NECL Outputs for driving long lines
Ideal for receiving signals from long lines
Fan out GHz Sinewave signals into four pairs of Differential NECL signals
1 PPS Distribution/IRIG-B Distribution
An Essential Lab Tool for Working with NECL Circuits

Features:

3.5 GHz typical f_MAX
Single-ended or Differential Inputs
Internal 50 Ω/-2 V Input Terminations also accept AC coupled PECL or Sinewave signals
Complementary Outputs drive 50 Ω loads terminated to -2 V or AC- coupled 50 Ω loads
DC- Coupled I/Os Compatible with ECLinPS or 100 kH Devices
SMA I/O Connectors
Ready-to-Use 1.3 x 2.9 x 2.9-in. module includes AC/DC Adapter

Description

The PRL-434A is a 1:4 Differential NECL Fanout Buffer module. It is intended for fanning out single-ended or differential NECL signals into four pairs of differential outputs. It can also be used for converting AC coupled GHz sinewave or PECL signals into differential NECL signals.

A switch selects either single-ended or differential inputs, as shown in Fig. 1. In the differential input mode, both inputs D and D are terminated internally into 50 Ω/-2 V, and, therefore, either one or both inputs can accept AC coupled signals as well. In the single-ended input mode, signals should be connected to the D inputs only. The D inputs are switched internally to V_BB, nominally -1.3 V, and termination resistors R_T for the D input channels are changed to 62 Ω. Complementary outputs of the PRL-434A are designed for driving 50 Ω loads terminated into -2 V. With internal pull-down resistors these outputs can also be AC coupled for driving 50 Ω loads terminated to ground or to other voltages.

The PRL-434A is housed in a 1.3 x 2.9 x 2.9-in. extruded aluminum enclosure and is supplied with a ±8.5 V/1.8 A AC/DC Adapter.

PRL-434A Block Diagram

(0° C ≤ T_A ≤ 35° C)*

Symbol	Parameter	PRL-434A			UNIT	Comments
Symbol	Parameter	Min	Typ	Max	UNIT	Comments
R_in	Input Resistance	49.5	50.0	50.5	Ω
V_TT	D Input Termination Voltage	-2.2	-2.0	-1.8	V	D input
V_T1	D Input Termination Voltage	-2.2	-2.0	-1.8	V	D input
V_T2	D Input Termination Voltage (variable)	-1.17	-1.30	-1.43	V	D input
V_IL	Input Lo Voltage	-1.95	-1.60	-1.48	V
V_IH	Input Hi Voltage	-1.13	-0.90	-0.81	V
V_OL	Output Lo Voltage	-1.95	-1.60	-1.48	V
V_OH	Output Hi Voltage	-1.13	-0.90	-0.81	V
I_DC1	DC Input Current, +8.5 V		0		mA
I_DC2	DC Input Current, -8.5 V		-360	-385	mA
V_DC1	DC Input Voltage, +8.5 V		N/A		V
V_DC2	DC Input Voltage, -8.5 V	-7.5	-8.5	-12	V
V_AC1	AC/DC Adapter Input Voltage, 120 VAC	103	115	127	V
V_AC2	AC/DC Adapter Input Voltage, 220 VAC	206	230	254	V
T_PLH	Propagation Delay to output ↑		1100	1500	ps
T_PHL	Propagation Delay to output ↓		1100	1500	ps
t_r/t_f	Rise/Fall Times (20%-80%)		250	360	ps	Note (1)
T_SKEW	Skew between any 2 outputs		20	75	ps
F_MAX	Max clock frequency	3.5	4.0		GHz	Note (2)
V_CMR	Common Mode Range	-2.15		-0.40	V	Note (3)
	Size	1.3 x 2.9 x 2.9			in.
	Weight	5			Oz
	Shipping Weight incl. AC adapter	4			lb.

*All dynamic measurements are made with outputs terminated into 50 Ω /-2 V, using the PRL-550NQ4X, four channel ECL Terminator, connected to a 50 Ω input sampling oscilloscope.

Notes:

(1). The output rise and fall times of each channel are measured with its complementary output terminated into 50 Ω/-2 V. An unused complementary 50 Ω 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-ACT-50 Dual Channel, AC Coupled 50 Ω Terminator for terminating unused outputs.

(2). f_MAX is measured using differential inputs only. Each pair of differential outputs are first divided by four, using the PRL-255N, and then measured using the PRL-550NQ4X, four channel ECL Terminator, connected to a sampling 'scope. 3.0 GHz guaranteed f_MAX is currently limited by production test equipment.

(3). When the unit is driven by an AC coupled sinewave signal in the differential input mode, the signal swing is symmetrical with respect to -2 V. The peak-to peak swing of the input signal should not exceed these Common Mode limits.