MAX7461

19-0553; Rev 0; 5/06 Loss-of-Sync Alarm General Description The MAX7461 single-channel loss-of-sync alarm (LOS) provides composite video sync detection in NTSC, PAL, and SECAM standard-definition television (SDTV) systems. The MAX7461’s advanced detection circuitry delivers robust performance by preventing false lossof-sync alarms due to noise. The device accepts an AC-coupled composite (CVBS), luma (Y), or any other video signal with sync, and outputs a logic-level signal. The open-drain LOS output is low when no sync is detected and high impedance when sync is detected. w w w . D a t a S h e e t 4 U . c o m The device operates from a single +5V supply. The MAX7461 is available in a 5-pin SOT23 package and is specified for operation over the -40°C to +85°C temperature range. ♦ Loss-of-Sync Alarm Output ♦ Robust Performance in Noisy Environments ♦ Wire-OR Alarm Output ♦ NTSC, PAL, and SECAM ♦ Small 5-Pin SOT23 Package Features ♦ Accepts CVBS, Y, or Any Other Video with Sync MAX7461 Ordering Information PART MAX7461EUK TEMP RANGE -40°C to +85°C PINPACKAGE 5 SOT23-5 PACKAGE CODE U5-2 Applications Security Systems Automotive Rear Seat Entertainment (RSE) Systems Consumer Electronics IN 1 Pin Configuration TOP VIEW 5 VCC GND 2 MAX7461 GND 3 4 LOS SOT23-5 Functional Diagram +5V 0.1µF VCC 5 VCC SYNC SLICE LEVEL MAX7461 RO SYNC DETECTOR SYNC LOS FILTER LOS 4 1kΩ CIN 0.1µF IN 1 CLAMP LPF 75Ω GND 3 ________________________________________________________________ ...