https://datasheetspdf.com/pdf-file/325258/NXP/TDA8373/1isolenz wrote:Hi All, First time poster, long time reader.
I just picked up a samsung txj2550. It has a TDA8373. I believe I have the proper pins nailed down (Pins 23,24,25 and 26 (blanking)).
The RGB voltage (based on the schematic for my tv) looks to be 3.3V, and I plan on using this primarily for JAMMA based boards which I understand are 0 -> 4V. I may want to use this down the road for SCART voltages in the future too though, which I understand top out at 0.7v.
I also have a PARSEC supergun which seems to output 0.7v RGB through it's BH7236AF IC which is an option for running my JAMMA based boards.
How should I handle this situation? Should I target a common input of 0.7v regardless of the situation and amplify the signal to 3.3v for the TDA8373? Or would I get better quality putting in multiple lines, one for JAMMA and bring it down a smidge, and another for other sources that I would need to amplify up?
Thanks!
TDA8373 accepts 0.7Vp-p RGB via pins 23,24 and 25. (see page 3 of the TDA837x datasheet V23-25 RGB input voltage)
I don't know exactly what the 3.3V that shows on the Samsung schematic against those pins refers to. Some kind of maximum rating or something. See it in other schematics too but have never been sure what it means.
Blanking is 0.9-3.0V on pin 26. (page 31)
Use the supergun to attenuate the Jamma RGB to 0.7Vp-p. You'll be ready for scart voltages then too.