Difference between revisions of "DRIVE50"

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== 50 Ohm Driver Card ==
 
== 50 Ohm Driver Card ==
  
* Line driver
+
* Line driver "TTL" Level
 
* 50 or 75 Ohm output impedance
 
* 50 or 75 Ohm output impedance
 +
* BNC or SMA output connector
 
* 10K pull-up on input
 
* 10K pull-up on input
 
* Card is non-inverting
 
* Card is non-inverting
* BNC or SMA connector
 
 
* 3V-5V power
 
* 3V-5V power
 
* 3-pin right angle 0.1" pitch input connector
 
* 3-pin right angle 0.1" pitch input connector

Revision as of 16:08, 6 July 2022

DRIVE50 FRONT 3D.png

50 Ohm Driver Card

  • Line driver "TTL" Level
  • 50 or 75 Ohm output impedance
  • BNC or SMA output connector
  • 10K pull-up on input
  • Card is non-inverting
  • 3V-5V power
  • 3-pin right angle 0.1" pitch input connector
  • (4) 4-40 mounting holes

Driver

  • 5x paralleled 74AC14 drivers
    • 24mA per pin
  • Schmitt Trigger Input
  • Input has single buffer stage
  • 3.3V, 250 Ohm resistors (/5) for 50 Ohm output
  • Short-circuit proof
    • 5V, 250 Ohms to ground is 20 mA (pins are rated for 24 mA
    • Normal output = 10 mA per pin

Test

  • Supply Vcc 3.3V to 5V and ground
  • Input is pulled up to Vcc
  • Measure output with BNC T
    • Should be 1/2 of Vcc with 50 Ohm terminator
    • Should be Vcc without terminator

Mechanicals

DRIVE50 MECHS REV1.PNG

Assembly Sheet