Industry's First Loss-of-Sync Alarm Fits in a SOT23 Package
| Note to the Editor: The MAX7461 simplifies loss-of-sync (LOS) detection. Common solutions today often use a sync separator that first extracts and then outputs the sync signal from video input. The sync signal then must be monitored by a microcontroller, functioning like a watchdog timeout circuit. The MAX7461 simplifies the LOS alarm process by pulling its /LOS\ signal low only when the input pin no longer detects a video sync signal. This approach eliminates the need for a microcontroller. In addition to simplifying the engineer's task, the MAX7461 is 9mm2, 1/3 the size of the closest competition (30mm2). Finally, the MAX7461 starts at $0.99 (1000-up) vs. the competition at $1.42. |
SUNNYVALE, CA-June 8, 2006-Maxim Integrated Products (NASDAQ: MXIM) introduces 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. 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 MAX7461 ideal 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 1/3 the size of the nearest competitor (30mm2). The part operates over the extended temperature range (-40°C to +85°C) and prices start at $0.99 (1000-up, FOB USA).
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