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First loss-of-sync alarm

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article image MAX7461 – an industry first.

MAXIM Integrated Products has introduced the MAX7461, a single-channel loss-of-sync (LOS) alarm that provides composite-video sync detection in NTSC, PAL, and SECAM standard-definition television (SDTV) systems.

Available through Arrow Electronics , this stand-alone LOS alarm operates from a single +5V supply while consuming only 1.7mA.

The low cost, small size, low power, and advanced detection circuitry make the MAX7641 suitable for security video systems, consumer electronics, and automotive rear-seat entertainment (RSE) systems.

The MAX7461 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.

This approach eliminates the need for a microcontroller, unlike the typical competitive solution that needs the microcontroller to monitor the signal.

Capable of detecting sync signals as small as 0.13Vp-p, the MAX7461 enhances sync detection with an internal filter that prevents false sync detection by reducing color burst, chroma, and system noise.

The MAX7461 is offered in a space-saving, 3mm x 3mm 5-pin SOT23 package that is one-third the size of the nearest competitor (30mm2). The part operates over the extended temperature range (-40°C to +85°C).

A data sheet for this product is available on the web at http://www.maxim-ic.com/MAX7461.

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