2 Ch. Translator, NECL to TTL

SKU:

$ 1,174.15

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 NECL Signals to TTL Signals
High Speed Digital Communications Systems Testing
High Speed SONET Clock Level Translation

Features:

f_max > 300 MHz
1.1 ns Typical Output Rise & Fall Times
50 Ω/-2 V Input for NECL
Single Ended or Differential Inputs.
Complementary 50 Ω TTL Level Outputs
SMA I/O Connectors
Self-contained 1.3 x 2.9 x 3.9-in. unit including AC/DC Adapter

Description

The PRL-450ND logic translator converts NECL signals to TTL signals. It can receive either single ended or differential input signals, selected by a switch. The outputs of these translators have 50 Ω back terminations, and, therefore, they can drive 50 Ω terminated or unterminated lines. These high speed translators facilitate testing of high speed digital communications circuits, where conversion of NECL clock and data signals to TTL level signals is often required.

The PRL-450ND is designed to interface with NECL circuits operating with a -5.2 V or -4.5 V supply.

In the differential input mode, both inputs D and D of the PRL-450ND are terminated into 50 Ω/-2 V. In this mode, 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 -1.3 V. The termination resistors, R_T, for the D input channels are changed to 62 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. 1A PRL-450ND Block Diagram

(0° C ≤ T_A ≤ 35° C)*

Symbol	Parameter	PRL-450ND			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_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_OL	Output Low Level	-150	0	300	mV
V_OH	Output High Level	2.0	2.2		V
I_DC1	DC Input Current, +8.5 V		280	300	mA
I_DC2	DC Input Current, -8.5 V		-395	-415	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 (10%-90%)		1.10	1.25	ns
t_SKEW	Skew between any 2 outputs		200	500	ps
f_max	Max Clock Frequency	300	400		MHz
	Size	1.3 x 2.9 x 3.9			in.
	Weight, excluding AC adapter	7			Oz
	Shipping weight, including AC adapter	4			lb.

* Unless otherwise specified, dynamic measurements are made with all outputs terminated into 50 Ω.

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