Please confirm or comment on these ADV7183B questions:
Firstly, we do not recommend the ADV7183B for new designs, Depending on the application, we would recommend the ADV7181C or ADV7401 or ADV7180.
1. Yes -it scales the full signal
2. Yes the brightness is an offset applied to the active video.
3. Yes - only scales active video range.
4. RANGE control is applied after the Gain/ brightness/contrast etc and scales the video to 16-235.
RANGE bit scales to make the data fit into 16-235 range. It means that no output value will be above 235 or less than 16.
So a x2 will be scaled to fit into 16-235.
on the range control, how does it set the scale factor to scale to the 16-235 range? Is this an automatic scaling over a line or over a field or frame?
response from my customer:
"If I have a signal that maxes out at 235, RANGE leaves it alone. If I now apply x2 gain, RANGE will scale it to 235 (ie. divide by 2), or clip it to 235 (remove the top half)?
Does this scaling/clipping apply to just the sample that exceeds 235, or the whole video line, or the whole field or frame containing this sample?"