2:16 Fanout Buffer, Univ. Diff./TTL Input, RS-422 Output, Triax I/Os

Applications:

• 2:16 Fanout Buffer
• Converting Differential NECL/LVDS/LVPECL/RS-422 or TTL Signals to RS-422
• Long Line Driver/Level Translator
• Reference Clock Distribution/Translation
• CLK/DATA Distribution/Translation
• 1 PPS Distribution/IRIG-B Distribution
• Telemetry and Avionics Distribution
• Test and System Integration

Features:

• f_max > 150 MHz for Differential Inputs
• f_max > 100 MHz for TTL inputs
• 1.6 ns Typical Rise & Fall Times for RS-422
• Channel-to-channel skew typically < 200 ps per bank
• Floating 100 Ω Universal Differential Inputs Accept LVDS, LVPECL, NECL, or RS-422 Inputs
• Separate TTL input (1 V minimum) Logically ORed with the Floating Differential Input
• 16 Complementary Outputs
• Triax Connectors for LVDS/LVPECL/NECL Inputs, BNC Connectors for TTL Input
• Triax Output Connectors
• Self-contained 3.0H x 6.8W x 7.3L-in. unit includes ±8.5V/1.8A AC/DC Adapter

Description

The PRL-4216UR-TR is a 2:16 fanout differential line driver module. Each bank has a pair of floating 100 Ω universal differential inputs suitable for accepting LVDS, LVPECL, NECL, or RS422 signals.⁽¹⁾ Each bank also has a a pair of logically ORed, 50 Ω TTL inputs with a minimum 1.0 V triggering threshold. Because the inputs are ORed a Hi level applied to either input can be used as a gate signal. Please see the block diagrams for more details.

The 16 pairs of differential RS-422 outputs are 62 Ω back-terminated and are designed for driving floating 124 Ω loads, normally the configuration used in RS-422 input circuits. The output swing is typically 2.3 V with a common mode voltage of 1.25 V.

A PRL-4216UR-TR is equivalent in function to two of the PRL-4108UR-TR units housed in a single enclosure. Each internal PCB is independent.

The PRL-4216UR-TR high speed fanout line driver facilitates testing of high speed digital communications circuits and distribution of satellite or telemetry signals.

The floating differential input accepts differential LVDS, LVPECL, NECL, RS422, or any 75 mV minimum differential signal within a common-mode range of -2.0 V to +3.0 V. When driven by LVPECL or NECL inputs, these signals must have internal 150 Ω or 200 Ω pull down resistors, respectively (known as a "source-biased" output). The PRL-4216UR-TR differential input is compatible with all LVPECL or NECL output signals from the PRL family of products.

The TTL input has a selectable 50 Ω/1 kΩ input load and will trigger on a minimum 1.0 V threshold. The 1 kΩ is useful for interfacing with low-power circuits.

The PRL-4216UL-TR is supplied with a ±8.5 V/1.8 A AC/DC Adapter and housed in a 3.0 x 6.8 x 6.0-in. extruded aluminum enclosure. Available accessories include voltage distribution modules and mating cables.

(1) A related series, the PRL-4216NL, has a true NECL input terminated into 50 Ω/-2 V, and can accept single-ended or differential NECL signals that do not have internal pull-downs.