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ADV7341 application problems 1

Adv7341 chip is used to output color stripe video. The oscilloscope collects and outputs waveforms where the positive level at the lowest point is not the negative level. According to the manual, the minimum level of waveform is -300mv. The lowest level of our output waveform is 0mV. How to adjust the lowest level of output waveform from 0mV to -300mv?

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