Difference between revisions of "VGAX49"
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* Series resistors present a voltage divider between the resistors on the card and the VGA load | * Series resistors present a voltage divider between the resistors on the card and the VGA load | ||
* 1V at 75 Ohms is 13.3 mA | * 1V at 75 Ohms is 13.3 mA | ||
| + | * Each color is independently driven | ||
=== 5:6:5 Resistor Simulation === | === 5:6:5 Resistor Simulation === | ||
| Line 38: | Line 39: | ||
* VGA presents a 75 Ohm load | * VGA presents a 75 Ohm load | ||
* Series resistors present a voltage divider between the resistors on the card and the VGA load | * Series resistors present a voltage divider between the resistors on the card and the VGA load | ||
| + | * 1V at 75 Ohms is 13.3 mA | ||
| + | * Each color is independently driven | ||
== Schematic == | == Schematic == | ||
Revision as of 17:58, 13 February 2020
Contents
Features
- Digital VGA adapter
- 16-bit digital video
- 5:6:5 (R:G:B) mapping (maximum)
- 2:2:2 (R:G:B) mapping (option)
- Uses summing resistors
- DB-15F connector
- 49x49mm ODAS form factor
- Mounting holes
Connectors
J1 - Digital Connections
P1 - VGA connector
Simulation
2:2:2 Resistor Simulation
- 3.3V Drive out of FPGA
- 1V is drive level for VGA specification
- 8 mA max drive current
- VGA presents a 75 Ohm load
- Series resistors present a voltage divider between the resistors on the card and the VGA load
- 1V at 75 Ohms is 13.3 mA
- Each color is independently driven
5:6:5 Resistor Simulation
- 3.3V Drive out of FPGA
- 1V is drive level for VGA specification
- 8 mA max drive current
- VGA presents a 75 Ohm load
- Series resistors present a voltage divider between the resistors on the card and the VGA load
- 1V at 75 Ohms is 13.3 mA
- Each color is independently driven
