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How to use the undocumented "DIGITAL CVBS INPUT" from the ADV7802

Thread Summary

The user is designing a board using the ADV7802 chip and wants to use the digital CVBS input mode. The final answer suggests that a hidden MUX or undocumented register can select the CVBS decoder's input source as digital (12-bit parallel) over D[11:0], clocked at 28.63636 MHz. For early design, it's recommended to route D[11:0] and CLKIN, and add a test header or mux to toggle between analog and digital CVBS paths. The accompanying answers clarify that there are no specific registers for this mode and suggest connecting the MCU/FPGA to CLKIN(78) for testing.
AI Generated Content
Category: Datasheet/Specs
Product Number: ADV7802

Hello , I'm an independent developer working on designing a board using your ADV7802 chip.

By looking at the internal diagram, I can see that the digital input are muxed at the same place as the digital output of the different 12bit ADC.

i also noticed in the datasheet that there is a mention of a "digital cvbs input mode" on the pin 78 (CLKIN).

It turns out I'm part of a project where I work with digital cvbs file. So i would love if i could use an mcu or an fpga to feed my digital cvbs to the chip so i could leverage his 3D decoder and 3D NR without going to analogue.

Could you guide me on how i could achieve this goal and how i could use that digital cvbs input mode.

I would really appreciate your help, thanks.