MAX7461 Datasheet, PDF (1/7 Pages) Maxim Integrated Products – Loss-of-Sync Alarm

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 loss-
of-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.
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.
Applications
Security Systems
Automotive Rear Seat Entertainment (RSE)
Systems
Consumer Electronics
Features
♦ Accepts CVBS, Y, or Any Other Video with Sync
♦ Loss-of-Sync Alarm Output
♦ Robust Performance in Noisy Environments
♦ Wire-OR Alarm Output
♦ NTSC, PAL, and SECAM
♦ Small 5-Pin SOT23 Package
Ordering Information
PART
MAX7461EUK
TEMP RANGE ^PIN-
PACKAGE
-40°C to +85°C 5 SOT23-5
PACKAGE
CODE
U5-2
Pin Configuration
TOP VIEW
IN 1
5 V_CC
MAX7461
GND 2
GND 3
4 LOS
SOT23-5
C_{IN IN}
1
0.1µF
75Ω
+5V
0.1µF
V_{CC 5}
SYNC
SLICE
LEVEL
CLAMP
LPF
GND 3
Functional Diagram
MAX7461
SYNC
SYNC
LOS
DETECTOR
FILTER
V_CC
RO
1kΩ
LOS
4
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