== NTSC ==
Pin 1 of the AD724 selects whether the output is in PAL or NTSC format. In the schematics and layouts above, pin 1 is grounded to select PAL, should you require NTSC, this pin needs to be disconnected from the ground and connected to a 5V signaland instead of the 4.433618 Crystal, you will need to use a 3.579545 Crystal.
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