Rainbow-electronics MAX7445 User Manual download pdf

General Description

The MAX7445 4-channel, buffered video reconstruction

filter is ideal for anti-aliasing and DAC-smoothing video

applications or wherever analog video is reconstructed

from a digital data stream (such as cable/satellite/ter-

restrial set-top boxes, DVD players, hard-disk recorders

(HDRs), and personal video recorders (PVRs)). This

device operates from a single +5V supply and has a

flat passband out to 5MHz with a stopband attenuation

of 43dB at 27MHz. This makes it ideal for use with

NTSC, PAL, and standard-definition digital TV (SDTV)

video systems. Each output is capable of driving two

standard 150Ω video loads.

The MAX7445 has three modes of operation. Mode 1

processes CVBS and RGB video signals. Mode 2

processes CVBS, Y, and C signals, as well as a second

asynchronous CVBS video signal. Mode 3 processes

RGB and CVBS (asynchronous) video signals. An exter-

nal pin adjusts the gain of the video buffer to either +6dB,

+9.5dB, or +12dB to accommodate video-encoder DAC

output signals of <1V. High-frequency boost circuitry pro-

vides picture sharpness with +1.2dB of gain boost with-

out degradation in the stopband. The output video drivers

can be disabled with an external pin.

The MAX7445 is available in a 14-pin TSSOP package

with an exposed pad, and is specified over the -40°C to

+85°C extended temperature range.

Applications

Set-Top Boxes/HDRs DVD Players

Game Consoles Digital VCRs

Desktop Video Editors

Features

♦ 4-Channel Filter and Buffer for CVBS, RGB, or Y/C

Video Signals

♦ Filter Response Ideal for NTSC, PAL, and

Interlaced SDTV Video Signals

♦ 43dB (typ) Stopband Attenuation at 27MHz

♦ ±0.75dB (max) Passband Ripple Out to 5MHz

♦ Blanking Level Voltage on Cable <1V

♦ Each Channel Drives Two 150Ω Video Loads

♦ +5V Single-Supply Voltage

♦ Selectable Gain: +6dB, +9.5dB, and +12dB

♦ Small 14-Pin TSSOP Package

MAX7445

4-Channel Video Reconstruction Filter

________________________________________________________________ Maxim Integrated Products 1

GAIN

GND

MAX7445

OUTA

OUTB

OUTC

OUTD

75Ω

*OPTIONAL CAPACITORS

INA

0.1µF

INB

INC

IND

D/A

ENCODER

D/A

SYNC

DETECTOR

LOWPASS

FILTER

LOWPASS

FILTER

LOWPASS

FILTER

LOWPASS

FILTER

SYNC

DETECTOR

DISABLE

SELECT

Functional Diagram

Ordering Information

19-2948; Rev 0; 8/03

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.

*EP = Exposed pad.

Pin Configuration appears at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX7445EUD -40°C to +85°C 14 TSSOP-EP*

1 2 3 4 5 6 7 8

Summary of Contents

Page 1 - Ordering Information

General DescriptionThe MAX7445 4-channel, buffered video reconstructionfilter is ideal for anti-aliasing and DAC-smoothing videoapplications or wherev

Page 2 - ELECTRICAL CHARACTERISTICS

MAX74454-Channel Video Reconstruction Filter2 _______________________________________________________________________________________ABSOLUTE MAXIMUM

Page 3

MAX74454-Channel Video Reconstruction Filter_______________________________________________________________________________________ 3ELECTRICAL CHARAC

Page 4 - = +5V, V

MAX74454-Channel Video Reconstruction Filter4 _______________________________________________________________________________________Typical Operating

Page 5 - Detailed Description

MAX74454-Channel Video Reconstruction Filter_______________________________________________________________________________________ 5Detailed Descript

Page 6 - Applications Information

MAX74454-Channel Video Reconstruction Filter6 _______________________________________________________________________________________High-Frequency Bo

Page 7 - Pin Configuration

Exposed PadsThe TSSOP-EP package has an exposed pad on thebottom of the package. This pad is electrically connect-ed to GND and should be connected to

Page 8 - Package Information

MAX74454-Channel Video Reconstruction FilterMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Ma

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Rainbow-electronics MAX7445 User Manual

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