Sunnyvale, Calif.—Maxim says its MAX7461 is the industry's first single-channel loss-of-sync (LOS) alarm
that provides composite-video sync detection in NTSC, PAL, and SECAM standard-definition television (SDTV) systems. This stand-alone LOS alarm, versus traditional microcontroller-watchdog/based solutions that rely on a sync separator that first extracts and then outputs the sync signal from video input, is suited for security video systems, consumer electronics, and automotive rear-seat entertainment (RSE) systems.
The MAX7461, working from a 5-volt input, accepts an AC-coupled composite (CVBS), luma (Y), or sync-on-green (SoG) video signal. When the MAX7461's input pin no longer detects a video sync signal, the device generates an alarm by pulling the open-drain output (LOS) low. Capable of detecting sync signals as small as 0.13V p-p, the MAX7461 enhances sync detection with an internal filter that prevents false sync detection by reducing color burst, chroma, and system noise.
Click here for the product datasheet. The MAX7461, in a 3-by-3 mm 5-pin SOT23 and rated for operation over -40 to +85°C, is priced starting at 99 cents each (1000-up, FOB USA).
Maxim Integrated Products , 1-800-998-8800, www.maxim-ic.com