1:4 TTL/CMOS Fanout Buffer and Line Driver, 5 V into 50 Ohms

Applications:

• 1 PPS Distribution for GPS applications requiring 5 V into a 50 Ω Load
• 5V TTL/CMOS Clock Distribution
• 1:4 Fanout Line Drivers
• High Speed Digital Communications System Testing
• Mini-Modular Instrument

Features:

• f_max > 75 MHz, 80 MHz Typical
• 5 V outputs for Driving 50 Ω loads
• Drives 100 ft of cable @ 50 MHz
• 2 ns Typical Output Rise & Fall Times
• TTL Compatible 50 Ω or 10 kΩ Input
• Four in-phase 50 Ω TTL Outputs
• BNC or SMA I/O Connectors
• DC Coupled I/Os
• Self-contained 1.3 x 2.9 x 3.9-in unit includes an AC/DC Adapter

Description

The PRL-414B-C003 is a 1:4 fanout 50 Ω TTL Line Driver. It is a modified version of the popular PRL-414B, with the outputs enhanced to deliver 5 V into 50 Ω loads. It is intended for distribution of high-speed clock and logic signals to multiple loads via long lines. With 50 Ω load terminations all outputs of the PRL-414B-C003 can drive 100 ft of 50 Ω cables at clock rates greater than 50 MHz. The PRL-414B-C003 is most frequently used for distributing 1 PPS clock signals from popular GPS receivers to multiple instruments requiring 5 V into 50 Ω loads.

The input resistance of the PRL-414B-C003 can be selected to be either 50 Ω or 10 kΩ by a switch.  The 10 kΩ-input is desirable when interfacing with low power circuits.  All I/Os are DC coupled and have BNC or SMA connectors.

The PRL-414B-C003 is housed in a 1.3 x 2.9 x 3.9-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-414B-C003 is shown in Fig. 1.