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ViewSonic Corporation
Confidential - Do Not Copy
VA702-3_VA702b-3
4
ELECTRICAL REQUIREMENTS
Horizontal / Vertical Frequency
Horizontal Frequency
30 – 80
kHz
Vertical Refresh Rate
50 –85
Hz.
Maximum Pixel Clock
135
MHz
Sync Polarity
Independent of sync polarity.
Primary Presets
Primary Preset
1280 x 1024
@ 60Hz
Look up table timing
<<Analog>>
640 x 350 @ 70Hz, 31.5kHz
640 x 480 @ 60Hz, 31.5kHz
640 x 480 @ 67Hz, 35.0kHz
640 x 480 @ 75Hz, 37.5kHz
640 x 480 @ 72Hz, 37.9kHz
640 x 480 @ 85Hz, 43.27kHz
720 x 400 @ 70Hz, 31.5kHz
800 x 600 @ 56Hz, 35.1kHz
800 x 600 @ 60Hz, 37.9kHz
800 x 600 @ 75Hz, 46.9kHz
800 x 600 @ 72Hz, 48.1kHz
800 x 600 @ 85Hz, 53.7kHz
832 x 624 @ 75Hz, 49.7kHz
1024 x 768 @ 60Hz, 48.4kHz
1024 x 768 @ 70Hz, 56.5kHz
1024 x 768 @ 72Hz, 58.1kHz
1024 x 768 @ 75Hz, 60.0kHz
1024 x 768 @ 85Hz, 68.67kHz
1280 x 1024 @ 60Hz, 63.4kHz
1280 x 1024 @ 75Hz, 79.97kHz
21. 1280x720 @ 60Hz, 45kHz (HDTV)
Changing Modes
Maximum Mode Change Blank Time, for
image stability. Note:
1) Excluding “Auto Adjust” time
2) Under DOS mode (640 x 350, 720 x 400 & 640 x
400), there is no “Auto Adjust” feature.
3) The monitor needs to do “Auto Adjust” the first
time a new mode is detected.
3 seconds (Max)
1 seconds (Typ) for recognized timings
1-2 seconds (Typ) for unrecognized timing
.
Mode Change Image
The image shall blank while the monitor changes modes.