I'm looking at using ADV7123 to generate a composite output. On FPGA, I have a NTSC encoder which outputs a clock and 10-bit data. I'm thinking to connect the output of NTSC encoder to one channel of ADV7123 and use the corresponding analog channel to produce composite video output. Can I use ADV7123 in the way I have described here ? Is there anything important that I need to take care other than grounding the unused channels ?