PRL-444 Four Channel High Input Impedance 50 Ω TTL Line Driver

Mini Modular Instruments > Line Drivers > PRL-444

Applications:

• Converting Conventional TTL/CMOS Outputs to 50 Ω TTL Outputs
• Long Line Drivers
• High Speed Digital Communications System Testing
• Basic Lab Tool
• 1 PPS/IRIG-B Line Driver
• HI/LO Logic Level Generation

Features:

• f_max > 70 MHz Normal/50 MHz Invert
• Drives 100 ft of cable @ 50 MHz Normal
• 2 ns Typical Output Rise & Fall Times
• Four independent TTL Compatible 10 kΩ Inputs
• Four independent 50 Ω TTL Outputs
• 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-444 is a four channel TTL/CMOS input, 50 Ω output TTL/CMOS Line Driver. It is intended for interfacing with computer I/O cards that have TTL outputs not suitable for driving 50 Ω lines. Each input has a 10 kΩ pulled up to 2.5 V so that it can also be driven by open-collector devices. The 50 Ω back-terminated outputs of the PRL-444 can drive long lines with or without 50 Ω load terminations. With 50 Ω load terminations, however, all outputs can drive 100 ft of 50 Ω cables at clock rates greater than 60 MHz. 

If the inputs are left open, all outputs will go Hi, because the inputs are pulled up to +2.5 V. All outputs can be set to the LO state, however, by either setting the polarity inverting switch to the down position or terminating all inputs to 2 kΩ or lower. The polarity- inverting switch enables easy generation of four static Hi/Lo logic signals when the inputs are not driven.

The PRL-444 is housed in a 1.3 x 2.9 x 2.9-in. extruded aluminum enclosure and is supplied with a ±8.5 V/±1.4 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 desired, a pair of the #35001420 mounting brackets can accommodate any two PRL modules of the same length. Please refer to the Accessories Section of the literature for more detail.

A block diagram showing the equivalent input and output circuits of the PRL-444 is shown in Fig. 1.

Detail | Diagram | Specifications | Test Results | Datasheet