AD724 is a low cost RGB to NTSC/PAL Encoder that converts red, green and blue color component signals into their corresponding luminance (baseband amplitude) and chromi- nance (subcarrier amplitude and phase) signals in accordance with either NTSC or PAL standards.
The AD724 is a low‑cost, single‑supply (+5 V) RGB to NTSC/PAL encoder that converts red, green, and blue video signals into luminance, chrominance, composite, and S‑Video outputs. It supports both NTSC and PAL standards, offers logic‑selectable encoding modes, and drives 75 V reverse‑terminated loads without external filters or delay lines.
The datasheet provides detailed specifications, pin functions, ordering information, and theory of operation, including clocking options (FSC or 4FSC), internal PLL, and on‑chip DC clamping. Layout considerations and ESD precautions are also covered.
| Supply Voltage (Recommended Range) | +4.75 V to +5.25 V |
|---|---|
| Quiescent Current (Encode Mode) | 42 mA |
| Full‑Scale Input Amplitude | 714 mV p‑p |
| Luminance Roll‑Off (NTSC) | -7 dB |
The AD724 operates from a single +5 V supply with a recommended range of +4.75 V to +5.25 V.
The device requires minimal external components; no external filters or delay lines are needed.
Logic LOW is 1 V and Logic HIGH is 2 V.
The maximum full‑scale input amplitude is 714 mV peak‑to‑peak.