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.
♦
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
PIN-
PACKAGE
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
V
CC
GND 2
MAX7461
GND 3
4
LOS
SOT23-5
Functional Diagram
+5V
0.1µF
V
CC
5
V
CC
SYNC
SLICE
LEVEL
MAX7461
RO
1kΩ
SYNC
DETECTOR
SYNC
LOS
FILTER
LOS
4
C
IN
0.1µF
75Ω
IN
1
CLAMP
LPF
GND 3
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
