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General Description

The MAX7447 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 MAX7447 processes S-Video and CVBS video sig-

nals. The video output buffers have a fixed gain of +6dB.

Each channel has high-frequency boost circuitry that pro-

vides picture sharpness with up to +1.2dB of gain boost

without degradation in the stopband. The output video

drivers can be disabled with an external pin.

The MAX7447 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 S-Video and

CVBS 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 Output <1V

♦ Each Channel Drives Two 150Ω Video Loads

♦ +5V Single-Supply Voltage

♦ Small 14-Pin TSSOP Package

MAX7447

4-Channel S-Video, CVBS Video Filter with

Asynchronous CVBS Input

________________________________________________________________ Maxim Integrated Products 1

DISABLE

GND

MAX7447

OUTA

OUTB

OUTC

OUTD

75Ω

*OPTIONAL CAPACITORS

INA

0.1µF

INB

INC

IND

D/A

ENCODER

CVBS

D/A

SYNC

DETECTOR

LOWPASS

FILTER

LOWPASS

FILTER

LOWPASS

FILTER

LOWPASS

FILTER

SYNC

DETECTOR

Functional Diagram

Ordering Information

19-2950; 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

MAX7447EUD -40°C to +85°C 14 TSSOP-EP*

1 2 3 4 5 6

Asynchronous CVBS Input 1

Indice de contenidos

Pagina 1 - Asynchronous CVBS Input

General DescriptionThe MAX7447 4-channel, buffered video reconstructionfilter is ideal for anti-aliasing and DAC-smoothing videoapplications or wherev

Pagina 2

MAX74474-Channel S-Video, CVBS Video Filter withAsynchronous CVBS Input2 _____________________________________________________________________________

Pagina 3

MAX74474-Channel S-Video, CVBS Video Filter withAsynchronous CVBS Input_______________________________________________________________________________

Pagina 4

MAX74474-Channel S-Video, CVBS Video Filter withAsynchronous CVBS Input4 _____________________________________________________________________________

Pagina 5

FilterFilter ResponseThe reconstruction filter consists of two 2nd-order Sallen-Key stages. The Butterworth-type response features amaximally flat pas

Pagina 6

MAX74474-Channel S-Video, CVBS Video Filter withAsynchronous CVBS InputMaxim cannot assume responsibility for use of any circuitry other than circuitr

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