GFT644 | 4 Channel 50 Ω TTL Line Driver Module
The GFT644 module is specially designed for interfacing signal and 50 Ω long cable.
The input threshold can be set to 1.5 or 0.0 or -1.5 V and the input load can be selected from 50 Ω to 1 KΩ pull up by a front panel switch. So that channel input can be driven directly by TTL / CMOS logic levels or open collector or negative pulse ( 0 to -2 V) or AC coupled signal ( +0.5 to -0.5 V)
All outputs with 50 Ω load can drive 100 feet of cable at clock rate greater than 200 MHz with 2.5 V amplitude. Each output polarity can be set normal or inverted and is compatible with DC or AC TTL input.
The GFT644 is a compact module supplied with a +5V AC/DC adapter
Typical GFT644 application includes to distribute four independent High speed signals to four devices via long cable (up to 100 feet) with TTL level.
Overview
Features
- Up to 200 MHz clock rate
- Drive 100 feet of cable at 200 MHz
- Four independent inputs with:
- Selectable threshold (+1 or 0 or -1 V)
- Selectable internal load ( 50 Ω or 1 kΩ pull up)
- Four 50 Ω TTL outputs with:
- Selectable polarity (Normal or Inverted)
- 1 ns typical output rise & fall time
- 10 ps input to output RMS jitter
- Operate from DC +5 V
- Compact module: 115 x 80 x 30 mm
Applications
- High speed digital communication
- High to low Impedance converter
- Pulse inverter
- Level translator
- Sine to square wave converter
- Long line Drivers
- Tools for lab
- Components Test equipment
Specifications
Input
Number
4
Range
+5 V to -5 V (max.)
Threshold Level
Preset to -1 V or 0 V or +1 V
Internal Load
Adjustable to 50 Ω or 1 kΩ pulled up to +5 V
Minimum Pulse Width
5 ns
Output
Number
4
Output Resistance
50 Ω
Low Level
0.5 V
High Level
2.5 V @ Load=50 Ω, 4 V @ Load > 10 kΩ
Rise/Fall Times
1 ns / 1ns @ 100 MHz square wave
Polarity From Input
Normal or Inverted
Jitter RMS
10 ps (Input to output)
Max Clock Frequency
200 MHz @ cable length = 3 feet
200 MHz @ cable length = 100 feet
Skew
500 ps (TBC)
General Specifications
Control
Switches to select:
- input load (common)
- input threshold (common)
- Output mode: normal or inverted (individual)
Power on Indicator
Inputs & Outputs
All are BNC connectors
Size
W=115, L=80, H=30 mm
Power V/A
+5 V / 200 mA max.
External AC (90 -240 V) to DC (+ 5 V) adapter furnished
Power Connector
Jack 2.10 mm
Option
GFT614 Module
1 input to 4 Line 50 Ω Driver Module
Technical Resources
Frequently Asked Questions (FAQ)
Downloadable Resources
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