2 Ch. LVPECL to NCML Level Translator

SKU:

$ 1,305.25

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:

Converting Single-ended or Differential LVPECL Inputs to Differential NCML Outputs
Differential LVPECL Inputs also accept Sinewave Signals
High Speed Digital Communications System Testing
Satellite/Radar/Telecommunications System Integration

Features:

f_MAX > 1.5 GHz
650 ps t_r
50 Ω/+1.3 V LVPECL Input Termination
Complementary NCML Outputs
DC Coupled SMA I/O Connectors
Self-contained 1.3H x 2.9W x 3.9D unit includes AC/DC adapter

Description

The PRL-427LP is a 2-channel LVPECL to differential NCML Logic Level Translator module. Each channel has a single-ended or differential LVPECL input and a ground-referenced differential 35 Ω NCML output. The NCML DC output logic Hi/Lo levels are 0 V and -350 mV, respectively, when terminated to ground-referenced 50 Ω loads.

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, where V_TT is equal to +1.3 V for LVPECL. In the differential input mode, therefore, either one or both inputs can accept AC coupled signals as well. In the single input mode, signals should be connected to the D inputs only. The D inputs are switched internally to V_BB, nominally +2.0 V for LVPECL, and termination resistors R_T for the D input channels are changed to 62 Ω.

These Logic Level Translators are designed specifically for use in testing and interfacing of high speed digital communications circuits, where conversion between LVPECL and NCML logic signals is often required. The PRL-427LP is part of the Mini Modular Instrument™ (MMI) family that find increasing applications in high speed digital data recording instruments, transient recording instruments and other high speed measurement equipment where LVPECL and NCML signals are often specified.

Fig. 1 PRL-427LP Block Diagram

(0° C ≤ T_A ≤ 35° C)*

Unless otherwise specified, all logic level and dynamic measurements are made with all outputs terminated into 50 Ω/V_TT, where V_TT = 0 V for NCML outputs.

SYMBOL	PARAMETER	PRL-427LP			UNIT
SYMBOL	PARAMETER	Min	Typ	Max	UNIT
R_IN	Input Resistance	49.5	50.0	50.5	Ω
R_OUT	Output Resistance		35		Ω
V_TT	D Input Termination Voltage (fixed)	1.18	1.30	1.43	V
V_T1	D Input Termination Voltage	1.18	1.30	1.43	V
V_T2	D Input Termination Voltage (variable)	1.80	2.00	2.20	V
V_IL	Input Lo Voltage	1.35	1.48	1.67	V
V_IH	Input Hi Voltage	2.08	2.28	2.42	V
V_OL	DC Output Low Level		-0.35		V
V_OH	DC Output High Level		0		V
V_OPP1	Output Logic Swing from DC-500MHz	300	350		mV
V_OPP2	Output Logic Swing from 500MHz-1GHz	275	300		mV
V_OPP3	Output Logic Swing from 1GHz -1.5GHz	225	260		mV
V_OCM	Output Common Mode Voltage		-200		mV
I_DC1	DC Input Current, +8.5 V		160		mA
I_DC2	DC Input Current, -8.5 V		-315		mA
V_DC	DC Input Voltage	±7.5	±8.5	±12.0	V
V_AC	AC/DC Adapter Input Voltage	108	120	132	V
t_PLH	Propagation Delay to output ↑		1.5		ns
t_PHL	Propagation Delay to output ↓		1.5		ns
t_R/t_F	Rise/Fall Times (10-90%)		650	750	ps
T_SKEW	Skew between any 2 outputs		40	75	ps
V_INI	Minimum Input Voltage @ 150 MHz	20	10		mV_pp
V_INII	Minimum Input Voltage @ 250 MHz	20	10		mV_pp
f_MAX	Max Clock Frequency	1250	1500		MHz
	Size	1.3H x 2.9W x 3.9D			in.
	Weight, excluding AC adapter	7			Oz
	Shipping weight, including AC adapter	4			lb.

For the PRL-427LP, 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.

While we believe these model to be accurate, no representations are made as to accuracy or suitability for any application: