2 Channel TTL to RS-422 Logic Level Translator

SKU:

$ 1,130.45

Quantity

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 TTL/CMOS Signals to Differential 124 Ω RS422 Signals
High Speed Digital Communications Systems Testing
Differential Long Line Drivers

Features:

f_max > 250 MHz
1.2 ns Typical Output Rise & Fall Times
TTL Compatible 50 Ω Input
1.5 V or 1.0 V Selectable Input Threshold
Complementary 124 Ω Outputs
BNC Input/SMA Output Connectors for PRL-420RS
BNC Input/Triax Output Connectors for PRL-420RSTR
SMA I/Os for PRL-420RS-SMA
DC Coupled I/Os
Self-contained 1.3 x 2.9 x 3.9-in. unit including an AC/DC Adapter

Description

The PRL-420RS is a dual channel line driver and level translator. It has a single-ended TTL input and differential 124 Ω RS-422 outputs. Each channel has a 50 Ω TTL/CMOS compatible input and a pair of differential 124 Ω outputs for driving long lines, in excess of 100 ft, terminated into differential 124 Ω loads. 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 makes it easy to interface with 3.3V TTL/CMOS devices.

The PRL-420RS outputs are designed to interface with the 124 Ω differential Serial Data/Data or Clock/Clock inputs of the data communications equipment and also for use in testing and interfacing of high speed digital communication circuits. The PRL-420RS complements other PRL-series Level Translators, such as the PRL-420ND/PD, PRL-450ND/PD, and PRL-460NPD/PND, etc., in system integration applications where interconnections among different logic signals are often necessary.

The PRL-420RS is a ready-to-use functional module housed in a 1.3 x 2.9 x 3.9-in. extruded aluminum enclosure and is supplied with a ±8.5 VAC/DC Adapter. BNC input and SMA output connectors are provided for the PRL-420RS model, Triax output connectors for the PRL-420RSTR model, and SMA I/Os for the PRL-420RS-SMA model. A block diagram showing the equivalent input and output circuits are shown in Figs. 1A and 1B.

Fig. 1A: PRL-420RS and PRL-420RS-SMA Top Cover Decal

Fig. 1B: PRL-420RSTR Top Cover Decal

(0° C ≤ T_A ≤ 35° C)*

Symbol	Parameter	Min	Typ	Max	Unit	Comments
R_IN	Input Resistance	49.5	50	50.5	Ω
R_OUT	Differential Output Resistance	122.6	124	125.3	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	0.5	V
V_OL	RS-422 Output Low Level	-0.05	0.0	0.2	V	Diff.124 Ω load
V_OH	RS-422 Output High Level		2.3	2.5	V	Diff.124 Ω load
I_DC1	DC Input Currents, +8.5 V		185	200	mA
I_DC2	DC Input Currents, -8.5 V		-255	-275	mA
V_DC	DC Input Voltages	±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%)		1.2	1.4	ns	Note (1)
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, excluding AC adapter	5			Oz
	Shipping Weight, including AC adapter	4			lb

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

Notes:

(1). The output rise and fall times are measured with both the Q and Q outputs terminated into 50 Ω. If an unused complementary output is left unterminated, a slight increase in rise and fall times will result.

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

PRL-420RS: