Difference between revisions of "DRIVE50"
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=== Driver === | === Driver === | ||
| − | * 5x paralleled [ | + | * 5x paralleled [https://www.ti.com/lit/ds/symlink/cd74ac14.pdf?HQS=dis-mous-null-mousermode-dsf-pf-null-wwe&ts=1658486403853&ref_url=https%253A%252F%252Fwww.mouser.com%252F 74AC14] drivers |
** 24mA per pin max current output | ** 24mA per pin max current output | ||
*** Symmetric high-low drive levels | *** Symmetric high-low drive levels | ||
Revision as of 10:42, 22 July 2022
50 Ohm Driver Card
- "TTL" Level Line driver
- 50 or 75 Ohm output impedance
- BNC or SMA output connector
- 10K pull-up on input
- Card is non-inverting
- 1.5V-5.5V power
- Typically 3.3V or 5V
- 3-pin right angle 0.1" pitch input connector
- (4) 4-40 mounting holes
Driver
- 5x paralleled 74AC14 drivers
- 24mA per pin max current output
- Symmetric high-low drive levels
- Short-circuit proof
- 5V, 250 Ohms to ground is 20 mA (pins are rated for 24 mA
- 24mA per pin max current output
- Card input has single buffer stage
- Schmitt Trigger Input
- 3.3V, 250 Ohm resistors (/5) for 50 Ohm output
- 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
