AD724 with subcarrier frequency lock

Hi,

I would like to generate CVBS with the AD724 or AD725, with the colour subcarrier locked to an existing video signal, for an OSD application. Is this possible?

I'm thinking to use an MC44144 to lock to the colourburst, then buffer the 4FSC output using a comparator to convert the AC sinewave to a TTL square wave. Will this work, or alternatively can anyone suggest a better method?

Thanks,

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