Rainbow Electronics MAX7452 - Manual

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°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
MAX7450
MAX7451
NOISE
FILTER
V CC
V
SS
75 Ω
75 Ω
LOS
SYNC SEPARATOR
AND AMPLITUDE
DETECTOR
AGCD
IN OUT VIDEO
INPUT
GND
±6dB 0 OR +6dB
GAIN SET (0dB OR +6dB)
Functional Diagram
*Future product—contact factory for availability.
**EP = Exposed pad.