The AD725 is a low-cost RGB to NTSC/PAL encoder that converts red, green, and blue color component signals into their corresponding luminance and chrominance signals according to NTSC or PAL standards. It features composite video output, luma trap port, TTL logic levels, integrated delay line, and auto-tuned filters.
The AD725 provides a compact solution for converting RGB video signals to NTSC or PAL standards. It offers composite video, S‑Video (luminance and chrominance) outputs and a dedicated Luma Trap (YTRAP) pin to suppress cross‑color artifacts. The device operates from a single +5 V supply, draws less than 1 µA in power‑down mode, and uses TTL‑compatible logic levels.
Typical applications include RGB/VGA to NTSC/PAL conversion for personal computers, video‑game consoles, video‑conference cameras and digital still cameras. The encoder features an integrated delay line, auto‑tuned filters and can drive 75 Ω reverse‑terminated loads directly.
| Input Amplitude Full Scale | 714 mV p‑p |
|---|---|
| Logic Low Input Voltage | 1 V |
| Logic High Input Voltage | 2 V |
| Luminance Bandwidth (NTSC) | 4.4 MHz |
| Chrominance Bandwidth (NTSC) | 1.2 MHz |
| Supply Voltage | +5 V (range +4.75 V to +5.25 V) |
| Quiescent Current (Encode Mode) | 30‑36 mA |
The AD725 operates from a single +5 V supply, with a recommended range of +4.75 V to +5.25 V.
It uses a dedicated Luma Trap (YTRAP) pin that provides a filter tap to suppress cross‑color artifacts.
Logic Low is defined as 1 V or less, and Logic High is defined as 2 V or greater.