PRL-4216U, 2:16 Differential Fanout Buffer, Universal Differential and TTL Inputs

Mini Modular Instruments > Fanout Buffers > PRL-4216U

Applications:

• 2:16 Fanout Buffer
• Converting Differential NECL/LVDS/LVPECL/RS-422 or TTL Signals to RS-422, TTL, NECL, or LVDS
• 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
• 300 ps Typical Rise & Fall Times for NECL Outputs, 1.4 ns for TTL, 1.2 ns 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
• SMA or Triax Connectors for LVDS/LVPECL/NECL Inputs, BNC Connectors for TTL Input
• SMA, BNC, or 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-4216U series is a family of 2:16 fanout differential line driver modules. All models have a pair of floating 100 Ω universal differential inputs suitable for accepting LVDS, LVPECL, NECL, or RS422 signals.⁽¹⁾ They also have 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.

A PRL-4216U is equivalent in function to two of the PRL-4108U units with the same suffixes, but housed in a single enclosure. Each internal PCB is independent.

The PRL-4216U high speed fanout line driver facilitates testing of high speed digital communications circuits and distribution of satellite or telemetry signals. There are 4 possible output logic levels and 3 possible I/O connector options:

The first suffix indicates the output logic level, e.g.:

• L for LVDS

• N for NECL

• R for RS-422

• T for TTL

The second suffix specifies input and output connectors, e.g. BNC, SMA, or TR (Triax):

For example, model PRL-4216UL-TR has LVDS outputs and Triax differential I/O connectors. The TTL input connector is always BNC.

At present the PRL-4216UL-TR is the only model available from stock, but additional connector and output logic options are available upon special order with modest NRE fees.

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-4216U 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 sixteen complementary outputs are back-terminated (except for NECL) and are designed for driving long lines. See the Specifications page for output levels.

The PRL-4216U 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-4216N, 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.

PRL-4216U | Detail | Diagram | Specifications
Datasheet (PRL-4216UL-TR)