MAX7450 Datasheet, PDF (1/9 Pages) Maxim Integrated Products – Video-Signal Conditioners with AGC and Back-Porch Clamp

19-3267; Rev 2; 11/04
Video-Signal Conditioners with AGC and
Back-Porch Clamp
General Description
The MAX7450/MAX7451/MAX7452 complete front-end
video-signal conditioners are designed to improve the
quality of standard-definition video signals. The devices
restore the DC level of the video input, correct for
amplitude errors up to ±6dB, detect fault conditions,
and filter out-of-band noise. The MAX7450/MAX7451/
MAX7452 optimize the signal quality for further video
processing through a crosspoint switch or video
decoder (ADC). Each device integrates an input video
clamp, automatic gain control (AGC), loss-of-sync
(LOS) detector, and an out-of-band noise/lowpass filter.
These devices also incorporate a user-selectable
buffer gain (0 or +6dB) and an AGC-disable function.
The MAX7450 and MAX7451 operate from dual power
supplies of ±5V or ±3.3V respectively, and they restore
the video blanking level to GND. The MAX7452 operates
from a single +5V supply and features a user-adjustable
clamp level.
The devices are available in an 8-pin SO package with
an exposed pad and are specified for operation over
the extended (-40°C to +85°C) temperature range.
Applications
Signal Conditioner for Standard-Definition
Video Inputs
Security Video Systems
Video-Switching Systems
V_CC
Features
♦ Back-Porch Clamp to GND (MAX7450/MAX7451)
♦ Adjustable Back-Porch Clamp (MAX7452)
♦ Automatic Gain Control (±6dB Range) Normalizes
Signals to Standard Video Level
♦ Input Fault Detection with LOS Output
♦ Inherent 50Hz/60Hz Input Rejection of 60dB
♦ Single-Supply Operation: MAX7452 (+5V)
♦ Out-of-Band Noise Filter
♦ Output Buffer Drives Standard 150Ω Video Load
with 0dB or +6dB Gain
♦ Dual-Supply Operation
MAX7450 (±5V)
MAX7451 (±3.3V)
♦ Tiny 8-Pin SO Package
Ordering Information
PART^†
TEMP RANGE
PIN-
PACKAGE
SUPPLY
VOLTAGE (V)
MAX7450ESA -40°C to +85°C 8 SO-EP*
±5
MAX7451ESA -40°C to +85°C 8 SO-EP*
±3.3
MAX7452ESA -40°C to +85°C 8 SO-EP*
+5
*EP = Exposed pad.
†_{Package code = S8E-12.}
Functional Diagram
GAIN SET (0dB OR +6dB)
VIDEO
IN
INPUT
NOISE
FILTER
±6dB
0 OR +6dB
OUT
75Ω
75Ω
SYNC SEPARATOR
AND AMPLITUDE
DETECTOR
LOS
AGCD
MAX7450
MAX7451
V_SS
GND
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