I have a question about ADV7180/ADV7181D/ADV728x/ADV748x or other analog input device.
ADV series can detect which standard is input to the video device.
How do ADV detect Analog signal is input or not input?
Does ADV looking ADC and if no there is not data, ADV judge nothing is input?
Or looking sync?
If ADV detect Analog is input, how does ADV detect which standard is input?
Looking sync frequency?
How do you lock analog input?
I think ADV is looking sync voltage ,sync frequency and lock and synchronize the output.
Is this correct?