1:4/1:2 TTL Complementary Fanout Line Driver

Applications:

• TTL/CMOS Clock Distribution
• 1:4 Fanout Line Drivers
• Single-ended to Differential Conversion
• 1 PPS Distribution/IRIG-B Distribution
• High Speed Digital Communications System Testing
• Mini-Modular Instrument

Features:

• f_max > 100 MHz
• Drives 100 ft of cable @ 80 MHz
• 2 ns Typical Output Rise & Fall Times
• TTL Compatible 50 Ω or 1 kΩ Input
• Four in-phase 50 Ω TTL Outputs
• Two invertible outputs for differential conversion
• BNC or SMA I/O Connectors
• DC Coupled I/O's
• Self-contained 1.3 x 2.9 x 2.9-in unit includes an AC/DC Adapter

Description

The PRL-414C is a 1:4 fanout 50 Ω TTL Line Driver. It is intended for distribution of high-speed clock and logic signals 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-414C can drive 100 ft of 50 Ω cables at clock rates greater than 80 MHz.

The inner two outputs of the PRL-414C can be inverted via a toggle switch to create two differential output channels that are compatible with many differential receivers, including most RS-422 receivers and our own PRL-425 series.

In 1:4 output mode the performance of the PRL-414C is generally similar to that of the PRL-414B, upon which it is based.

The input resistance of the PRL-414C can be selected to be either 50 Ω or 1 kΩ by a switch. The 1 kΩ-input is desirable when interfacing with low power circuits. All I/O’s are DC coupled and have BNC or SMA connectors.

The PRL-414C is housed in a 1.3 x 2.9 x 2.9-in. extruded aluminum enclosure and is supplied with a ±8.5 V/± 1.8 A AC/DC Adapter. A maximum of four units can share a single AC/DC adapter using the PRL-730 voltage distribution module. If mounting is needed, a pair of the #35001420 mounting brackets can accommodate any two PRL modules of the same length.

A block diagram showing the equivalent input and output circuits of the PRL-414C is shown in Fig. 1.