Difference between revisions of "DRIVE50"
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* Card is non-inverting | * Card is non-inverting | ||
* BNC or SMA connector | * BNC or SMA connector | ||
| − | * | + | * 3V-5V power |
* 3-pin right angle 0.1" pitch input connector | * 3-pin right angle 0.1" pitch input connector | ||
| + | |||
| + | == Driver == | ||
| + | |||
| + | * 5x paralleled [http://cva.stanford.edu/classes/cs99s/datasheets/74AC14.pdf 74AC14] drivers | ||
| + | ** 24mA per pin | ||
| + | * 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 | ||
== Test == | == Test == | ||
Revision as of 15:43, 6 July 2022
50 Ohm Driver Card
- Line driver
- 50 or 75 Ohm output impedance
- 10K pull-up on input
- Card is non-inverting
- BNC or SMA connector
- 3V-5V power
- 3-pin right angle 0.1" pitch input connector
Driver
- 5x paralleled 74AC14 drivers
- 24mA per pin
- 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
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
