Started by carlosemandrade, September 26, 2008, 03:49:27 AM
Quote from: carlosemandrade on September 26, 2008, 12:32:00 PMso i ned a sync separator (LM1881)
Quote from: carlosemandrade on June 05, 2009, 03:11:50 AMquite strange here... using csync direct from my old jap. megadrive a/v out causes image instability on some parts of screen, but using csync with 1881 from composite, no problem
Quote from: viletim on June 07, 2009, 11:06:11 PMMKL,I had the opportunity to check an original PAL Megadrive this evening. It has the sync pin of the AV port connected to pin 10 of the CXA1145 and pin 11 is not connected to anything. Are you absolutely sure yours isn't the same?
Quote from: viletim on June 07, 2009, 11:06:11 PMThe datasheet contains an application circuit with a resistor and capacitor in series with this pin 11 composite sync output. This suggests that it's not a TTL sync output at all. The Japanese data is meaningless to me but I had a look at the datasheet of a clone IC, the ES71145. If this is anything to go by this pin is basically a composite video output without the video. The output is listed as 0.29Vpp (typical).