NTSC is defined as 1Vpp comprised of 300mV to 1000mV for the analog signal and 0 to 300mV for the negative sync pulse. Blanking interval = 0.3V. In theory if you had the right ADC signals then you would need to gain up the signal from 700mVpp to 1Vpp. Check out SMPTE 170 for the waveforms and amplitudes
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