PRL-4220, 2:20 Fanout 50 Ω TTL/CMOS Line Driver

Mini Modular Instruments > Fanout Buffers > PRL-4220

Applications:

• TTL/CMOS Clock Distribution
• 2 x 1:10 Fanout Line Driver
• High Speed Digital Communications System Testing
• 1 PPS/IRIG-B Signal Distribution
• Mini Modular Instrument

Features:

• fMAX > 100 MHz
• Drives 100 ft of cable @ 80 MHz
• 1.8 ns Typical Output Rise & Fall Times
• 2.5 V into 50 Ω Typical
• TTL Compatible 50 Ω or 10 kΩ Input
• 20 in-phase 50 Ω TTL Outputs (two sets of 10)
• Active Low EN (Enable) Input
• BNC I/O Connectors
• DC Coupled I/Os
• Self-contained 3.0 x 6.8 x 4.0-in. unit includes an AC/DC Adapter

Description:

The PRL-4220 is a 2 x 1:10 fanout 50 Ω TTL Line Driver. It is intended for distribution of two independent high-speed clock and logic signals (e.g. CLK and DATA) to multiple loads via long lines. The 50 Ω back-terminated outputs can drive long lines with or without 50 Ω load terminations. With 50 Ω load terminations, however, all outputs of the PRL-4220 can drive 100 ft of 50 Ω cables at clock rates greater than 80 MHz. The PRL-4220 is implemented as two separate, independent 1:10 fanout buffers on two PCBs in a single enclosure.

The input resistance of each 1:10 fanout board can be independently selected to be either 50 Ω or 10 kΩ by a switch. The 10 kΩ-input is desirable when interfacing with low power circuits. The 50 Ω back terminated outputs typically deliver 2.5 V into 50 Ω or 5.0 V into Hi-Z loads. All I/Os are DC coupled and have BNC connectors. SMA I/Os are available on special order.

Each board also has a TTL-compatible EN input pulled down via a 1 kΩ resistor. When left open the Enable is active, and the fanout buffer will output signals. Each board can be disabled by driving its EN input high.

The PRL-4220 is housed in a 3.0 x 6.8 x 4.0-in. extruded aluminum enclosure and is supplied with the PRL-760C, ±8.5 V/±1.8 A AC/DC Adapter.

A block diagram showing the equivalent input and output circuits of the PRL-4220 is shown in Fig. 1.

Related Products:

• PRL-4110, 1:10 Fanout 50 Ω TTL Line Driver
• PRL-4122, 1:22 Fanout 50 Ω TTL Line Driver, equivalent to one PRL-414B driving two PRL-4110 units in a single enclosure
• PRL-4330, 3:30 Fanout 50 Ω TTL Line Driver, equivalent to three PRL-4110 units in a single enclosure

PRL-4220 | Detail | Diagram | Specifications | Datasheet