1:2 Differential NECL Fanout Buffer, SMA I/Os

SKU:

$ 1,384.60

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:

Fanout Single-ended Input signals into two pairs of Differential signals for driving long lines
Ideal for receiving signals from long lines
Fanout GHz Sinewave signals into two pairs of Differential NECL signals
1 PPS Distribution/IRIG-B Distribution
An Essential Lab Tool for Working with NECL Circuits

Features:

4 GHz f_MAX
Single-ended or Differential Inputs
Internal 50 Ω/V_TT Input Terminations also accept AC coupled Signals
Complementary Outputs drive 50 Ω loads terminated to V_TT
DC Coupled I/Os Compatible with ECLinPS or 10KH Devices
SMA I/O Connectors
Ready-to-Use 1.3 x 2 9 x 2 2-in. Module includes a ±8.5 V AC/DC Adapter

Description

The PRL-431AN is a 1:2 Differential Fanout NECL Buffer module. It is an essential lab tool for applications where it is necessary to drive two different loads from a single source of single-ended or differential NECL signals. It can also be used for converting GHz sine wave signals into two pairs of 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/V_TT*, and, therefore, either one or both inputs can accept AC-coupled signals as well. In the single input mode, signal should be connected to the D input only. The D input is switched internally to V_BB**, and the termination resistor R_T for the D input is changed to 62 Ω. Complementary outputs of the PRL-431AN 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.

Any single output from the PRL-431AN can drive a single-ended NECL input, but the complementary output should also be terminated into 50 Ω/V_TT or AC coupled into 50 Ω/GND.

The PRL-431AN is housed in a 1.3 x 2.9 x 2.2-in. extruded aluminum enclosure and supplied with a ±8.5 V/1.8 A AC/DC Adapter.

V_TT is nominally -2.0 V for ECL, +3.0 V for PECL, and +1.3 V for LVPECL. V_BBis nominally -1.3 V for ECL, +3.7 V for PECL, and 2.0 V for LVPECL.

Fig 1, PRL-431AN Block Diagram

(0° C ≤ TA ≤ 35° C)*

Symbol	Parameter	PRL-431AN			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 (fixed)	-2.2	-2.0	-1.8	V
V_T1	D Input Termination Voltage	-2.2	-2.0	-1.8	V
V_T2	D Input Termination Voltage (variable)	-1.17	-1.30	-1.43	V
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	-1.70	-1.48	V
V_OH	Output Hi Voltage	-1.13	-0.90	-0.81	V
I_DC	DC Input Current		-165	-180	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 ↑		500	950	ps
t_PHL	Propagation Delay to output ↓		500	950	ps
t_r/t_f	Rise/Fall Times (20%-80%)		250		ps	Note (1)
t_SKEW	Skew between any 2 outputs		20	75	ps
f_MAX	Max clock frequency	3.5	4.0		GHz	Notes (2)
V_CMR	Common Mode Range	-2.7		-0.4	V
	Size	1.3 x 2.9 x 2.2			in.
	Weight, excluding AC adapter	5			Oz
	Shipping weight, including AC adapter	4			lb.

*All measurements are made with outputs terminated into 50 Ω/V_TT, using the PRL-550NQ4X four channel NECL Terminators, connected to a 50 Ω input sampling oscilloscope.

Notes:

(1). The output rise and fall times are measured with with all inputs terminated into 50 Ω/V_TT. For best performance all outputs should be terminated into 50 Ω/V_TT or else AC- coupled into 50 Ω loads. If a single output is used, its complement must be terminated; otherwise output waveform distortion will occur. If one pair of complementary outputs is used, the other complementary pair may remain unterminated. Use the PRL-550NQ4X, four channel NECL Terminator, for the 50 Ω/V_TT termination and for connection of NECL signals to 50 Ω input oscilloscopes. The PRL-ACT-50, Dual Channel AC-Coupled 50 Ω Terminator, may also be used to provide the 50 Ω/V_TT termination. If preservation of DC levels is not required, then the PRL-SC-104, 0.1 µf DC block or a 12 dB AC-coupled attenuator may be used to connect the NECL/PECL/LVPECL outputs to 50 Ω input instruments.

(2). f_MAX is measured by AC coupling a sine wave to the D input using the differential input mode (switch up). The differential outputs are first divided by four, using the PRL-255N and then measured using the PRL-550NQ4X, four channel NECL Terminator, connected to a sampling scope.

1:2 Differential NECL Fanout Buffer, SMA I/Os

Applications:

Features:

Description

VTT is nominally -2.0 V for ECL, +3.0 V for PECL, and +1.3 V for LVPECL. VBB is nominally -1.3 V for ECL, +3.7 V for PECL, and 2.0 V for LVPECL.

(0° C ≤ TA ≤ 35° C)*

*All measurements are made with outputs terminated into 50 Ω/VTT, using the PRL-550NQ4X four channel NECL Terminators, connected to a 50 Ω input sampling oscilloscope.

VTT is nominally -2.0 V for ECL, +3.0 V for PECL, and +1.3 V for LVPECL. VBB is nominally -1.3 V for ECL, +3.7 V for PECL, and 2.0 V for LVPECL

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V_TT is nominally -2.0 V for ECL, +3.0 V for PECL, and +1.3 V for LVPECL. V_BBis nominally -1.3 V for ECL, +3.7 V for PECL, and 2.0 V for LVPECL.

*All measurements are made with outputs terminated into 50 Ω/V_TT, using the PRL-550NQ4X four channel NECL Terminators, connected to a 50 Ω input sampling oscilloscope.

V_TT is nominally -2.0 V for ECL, +3.0 V for PECL, and +1.3 V for LVPECL. V_BBis nominally -1.3 V for ECL, +3.7 V for PECL, and 2.0 V for LVPECL