1:4 and 2 x 1:2 RS-422 Fanout Buffer, Triax I/Os

SKU: PRL-414RSTR

$ 1,860.00

Applications:

  • RS-422 Fanout Buffer
  • Clock/Data Fanout Buffer
  • High Speed Digital Communications Systems Testing
  • Satellite Telemetry/Ground Station System Integration

Features:

  • fmax > 75 MHz
  • 2.8 ns Typical Output Rise & Fall Times
  • 1 ns Typical Channel to Channel Skew
  • Floating 124 Ω Differential Inputs for RS-422
  • 4 Complementary 124 Ω RS-422 Outputs
  • Triax I/Os, Trompeter CBBJR79 or compatible
  • Switchable 1:4 Fanout or 2 x 1:2 Fanout Mode for simultaneous CLK/DATA distribution
  • Self-contained 1.3 x 2.9 x 6.0-in. unit
    includes ±8.5 V/1.8 A AC/DC Adapter

Description

The PRL-414RSTR is a 1:4 fanout differential RS-422 line driver. It has two sets of floating 124 Ω differential inputs designed to accept RS-422 signals. The PRL-414RSTR high speed fanout line driver facilitates testing and integration of high speed digital communications circuits and distribution of satellite signals.

The PRL-414RSTR has two fanout modes, selectable by a toggle switch:

  • In the 1:4 mode (switch Up) D1 is connected to all four outputs Q1-Q4, and D2 is ignored. This mode is used for fanout of a single signal to four receivers.
  • In the 2 x 1:2 mode (switch Down) each of the two input signals is distributed to two outputs, with D1 connected to Q1-Q2, and D2 connected to Q3-Q4. This mode allows simultaneous distribution of Clock and Data signals to two receivers.

The four sets of differential outputs are 62 Ω back-terminated and designed for driving floating 124 Ω loads, normally the configuration used in RS-422 input circuits. The output swing is typically 1.40 V with a common mode voltage of 1.55 V. .

Because every output is independently buffered, unused outputs do not require termination, and outputs can even be shorted without affecting other outputs. These applications would not be possible with a passive splitter or powered distribution amplifier.

Multiple units of PRL-414RSTR can be cascaded for wider fanout, such as 1:16 or higher. The PRL-414RSTR can be combined with other PRL products and integrated into a rack-mount system using PRL's modular rackmount kit, PRL-MRK3-1.

All I/Os are Triax, using Trompeter CBBJR79 or equivalent, and will mate with any Trompeter 70-series Triax Cable Plug with 3 lugs, or compatible connector.

The PRL-414RSTR is supplied with a ±8.5 V/1.4 A AC/DC adapter and housed in a 1.3 x 2.9 x 6.0-in. extruded aluminum enclosure. Available accessories include voltage distribution modules and shielded twisted pair cables with Triax termination:

  • 88001140-36 Cable, Shielded Twisted Pair, 124 Ohm Triax to Triax, 36"
  • 88001140-48 Cable, Shielded Twisted Pair, 124 Ohm Triax to Triax, 48"

A related version with TTL/BNC inputs is also available, the PRL-414TRSBTR.