I'm developing TVP 5150 video decoder. I'm connecting its output directly to the ADV7393 encoder. During the tests in prototype board I noticed problem with stability of chroma aplitude. If I'm checking ColorBar test pattern and observing output (from ADV7393 encoder) on waveform analyser, I see fluctuations of chroma amplitude. Also on vectoroscope it is visible. If signal to the encoder (ADV7393) is send from different decoder, all works fine. I've repeated test on evaluation module TVP5150EVM Rev 1.2 with Encoder EVM Rev 1.1. Results were the same, oscilations of chroma level. Value of this oscilations is about 5% during 100% ColorBar test. I've tested in in PAL and NTSC mode, on PAL it is more visible.
Did anyone observe similar problem ?
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