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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

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

MAX7450/MAX7451/MAX7452

Video-Signal Conditioners with AGC and

Back-Porch Clamp

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-3267; Rev 0; 4/04

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.

PART

TEMP RANGE

PIN-

PACKAGE

SUPPLY

VOLTAGE (V)

MAX7450ESA

-40°C to +85°C8 SO-EP**

±5

MAX7451ESA*

-40°C to +85°C8 SO-EP**

±3.3

MAX7452ESA

-40°C to +85°C8 SO-EP**

MAX7450

MAX7451

NOISE

FILTER

75Ω

LOS

SYNC SEPARATOR

AND AMPLITUDE

DETECTOR

AGCD

OUT

VIDEO

INPUT

GND

±6dB

0 OR +6dB

GAIN SET (0dB OR +6dB)

Functional Diagram

*Future product—contact factory for availability.

**EP = Exposed pad.

1 2 3 4 5 6 7 8 9

Indice de contenidos

Pagina 1 - Back-Porch Clamp

General DescriptionThe MAX7450/MAX7451/MAX7452 complete front-endvideo-signal conditioners are designed to improve thequality of standard-definition v

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MAX7450/MAX7451/MAX7452Video-Signal Conditioners with AGC and Back-Porch Clamp________________________________________________________________________

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MAX7450/MAX7451/MAX7452Video-Signal Conditioners with AGC and Back-Porch Clamp4 ______________________________________________________________________

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MAX7450/MAX7451/MAX7452Video-Signal Conditioners with AGC and Back-Porch Clamp________________________________________________________________________

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MAX7450/MAX7451/MAX7452Video-Signal Conditioners with AGC and Back-Porch Clamp________________________________________________________________________

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MAX7450/MAX7451/MAX7452Video-Signal Conditioners with AGC and Back-Porch ClampMaxim cannot assume responsibility for use of any circuitry other than c

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