ANALOG DEVICES AD724JRZ

AD724 is a low cost RGB to NTSC/PAL encoder that converts red, green and blue colour component signals into their corresponding luminance (baseband amplitude) and chrominance (subcarrier amplitude and phase) signals in accordance with either NTSC or PAL standards. These two outputs are also combined to provide composite video output. All three outputs can simultaneously drive 75 ohm, reverse-terminated cables. All logical inputs are TTL, 3V and 5V CMOS compatible. The chip operates from a single +5V supply. No external delay lines or filters are required. It may be powered down when not in use. It accepts either FSC or 4FSC clock. When a clock is not available, a low cost parallel-resonant crystal (3.58MHz (NTSC) or 4.43MHz (PAL)) and the device’s on-chip oscillator generate the necessary subcarrier clock. It also accepts the subcarrier clock from an external video source. It is used in application such as RGB to NTSC or PAL encoding.