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Maxim releases LOS alarm offered in SOT23 package

Posted: 16 Jun 2006     Print Version  Bookmark and Share

Keywords:Maxim  MAX7461  single-channel  loss-of-sync  LOS 

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

According to Maxim, 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 this device suitable for security video systems, consumer electronics, and automotive rear-seat entertainment (RSE) systems, the company added.

This device accepts an AC-coupled composite (CVBS), luma (Y), or sync-on-green (SoG) video signal. When its 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, Maxim said, 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 device enhances sync detection with an internal filter that prevents false sync detection by reducing colour burst, chroma, and system noise, the company explained.

The new product is offered in a 3-by-3mm 5-pin SOT23 package that is one-third the size of the nearest competitor (30mm2), Maxim said. The part operates over the temperature range of -40°C to 85°C and prices start at Rs.44.66 (99 cents) (1,000-up, FOB USA).

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