µVGA.com: VGA Microcontroller interface
Q: What are VGA voltage levels?
Filed under FAQ / Electrical
Answer:
HSYNC/VSYNC are TTL signals, RED/GREEN/BLUE are 0.7V peak-to-peak (0V for black level, 0.7V for full color intensity). Some monitors provide support for 1V peak-to-peak signals, but they are not standardized.
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