vol.2 wrote:VEGETA wrote:
to my knowledge LMH1980 outputs TTL sync as well as XNOR ICs... therefore I must convert it to normal levels.
This chip is designed to interface with embedded LCD screens and such and outputs sync in CMOS logic. You are better off using a different chip that gives you regular sync IMO.
It's not impossible to translate the CMOS back to analog sync, but it's adding gobs of unnecessary complexity to your circuit. I would bet you can even find a TI chip that will do just that, but it's kinda nutty to do it. Sorry, can't help more than that.
I saw this IC as the best and most modern from TI, a direct replacement of 1881.
All I want is a Csync which works perfectly fine with YPbPr circuit + AD725 IC since I am building an RGB\RGBHV to composite, s-vide, and component transcoder.
LMH1980 low logic is a maximum of 0.5v while high logic is minimum of 4.5v (5v input supply), is connecting a 324R resistor in series with final csync as shown above ok to attenuate it?
the main function of this device is to safely convert these signals to be used with stuff like TVs, monitors, OSSC, and similar devices which accepts YPbPr, s-video, and composite.
TTL is normal‼ Video level is stupid and terrible‼
well, many people keep posting that this level destroys their scart and video equipment. I am well aware of dangers of higher voltage than rated but if current is so low then danger should be minimized... but I didn't test it on these type of equipment, so I cannot decide.