The AD724 was designed to have three allowable modes of
applying a clock via the FIN pin. These are FSC (frequency of
subcarrier) mode with CMOS clock applied, FSC mode using
on-chip crystal oscillator, and 4FSC mode with CMOS clock
applied. The FSC frequency is 3.579545 MHz for NTSC or
4.433618 MHz for PAL.
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