2 Ch. Translator, TTL to Differential TTL

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$ 822.25

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Product Description
Diagrams
Applications
Specifications
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Applications

Converting TTL/CMOS signals to Differential TTL Signals
Converting TTL/CMOS Signals to RS-422 Signals
High Speed Digital Communications system testing
1 PPS/IRIG-B Line Driver
Differential Line Drivers

Features:

f_MAX > 300 MHz
1.1 ns Typical t_r
50 Ω TTL/CMOS Input
1.5 V or 1.0 V Selectable Input Threshold
Complementary 50 Ω TTL Outputs
BNC Input/SMA Output Connectors
DC-Coupled I/Os
Self-contained 1.3 x 2.9 x 3.9-in. units including AC/DC Adapters

Description

The PRL-420TD is a dual channel single-ended input, differential output TTL Line Driver. Each channel has a 50 Ω TTL/CMOS compatible input and a pair of differential 50 Ω outputs for driving long lines with or without 50 Ω terminations. The input threshold voltage can be selected between 1.5 V and 1.0 V using a front panel switch. The 1.0 V threshold is useful when dealing with weak signals.

The PRL-420TD is intended for use in testing and interfacing of high speed digital communication circuits, where conversion from single-ended TTL/CMOS level signals to differential signals is often required. The differential TTL outputs can also drive RS-422 input circuits. It is an ideal building block that complements other PRL Level Translators, such as the PRL-450ND, PRL-450PD and PRL-460NPD, in systems integration applications where interconnections of signals having different logic levels are often necessary.

The PRL-420TD is a ready-to-use functional module housed in a 1.3 x 2.2 x 2.9-in. extruded aluminum enclosure and is supplied with a ±8.5 V AC/DC Adapter. BNC input and SMA output connectors are provided. A block diagram showing the equivalent input and output circuits of the PRL-420TD is shown in Fig. 1.

Fig. 1, PRL-420TD Block Diagram

(0° C ≤ T_A ≤ 35° C)*

Symbol	Parameter	PRL-420TD			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_TOSH	Input Threshold Voltage (high)	1.4	1.5	1.6	V
V_TOSL	Input Threshold Voltage (low)	0.9	1.0	1.1	V
V_IL	TTL input Low Level	-0.5	0.0	0.5	V
V_OL	TTL Output Low Level	-0.1	0.0	0.5	V
V_OH	TTL Output High Level	2.0	2.5	2.6	V
I_DC1	DC Input Current, +8.5 V		340	360	mA
I_DC2	DC Input Current, -8.5 V	-360	-340		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⁽¹⁾	Rise/Fall Times (10%-90%)		1.2	1.4	ns
t_SKEW	Skew between any 2 outputs		150	400	ps
f_MAX	Max Clock Frequency	250	300		MHz
	Size	1.3 x 2.9 x 3.9			in.
	Weight, excl. AC adapter	7			Oz
	Shipping weight, incl. AC adapter	4			lb.

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

PDF Datasheet