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ADV3201 Sync-tip clamp

I want to use ADV3201 to route RGB analog video . I have negative sync on analog video: my question is if I need dual supply or if sync-tip clamp feature has the option to avoid to use dual supply. More in general I don't understand how sync-tip clamp feature works. My target is to use a single supply (3.3V or 5VDC)

Thank you for your support

Best Regards

Marco Ruggeri

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