Rainbow-electronics MAX7446 Uživatelský manuál stáhnout pdf (Strana 1)

General Description

The MAX7446 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 MAX7446 processes CVBS and RGB video signals.

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

channel for CVBS video has high-frequency boost circuitry

that provides picture sharpness with +1.2dB of gain

boost without degradation in the stopband. The output

video drivers can be disabled with an external pin.

The MAX7446 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 Game Consoles

Desktop Video Editors DVD Players

Digital VCRs

Features

♦ 4-Channel Filter and Buffer for RGB 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 Cable <1V

♦ Each Channel Drives Two 150Ω Video Loads

♦ +5V Single-Supply Voltage

♦ Small 14-Pin TSSOP Package

MAX7446

4-Channel Video Filter for RGB and CVBS Video

________________________________________________________________ Maxim Integrated Products 1

DISABLE

GND

MAX7446

OUTA

OUTB

OUTC

OUTD

75Ω

*OPTIONAL CAPACITORS

INA

0.1µF

INB

INC

IND

D/A

ENCODER

CVBS

(WITHOUT SYNC)

D/A

SYNC

DETECTOR

LOWPASS

FILTER

LOWPASS

FILTER

LOWPASS

FILTER

LOWPASS

FILTER

Functional Diagram

Ordering Information

19-2951; 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

MAX7446EUD -40°C to +85°C 14 TSSOP-EP*

1 2 3 4 5 6

Shrnutí obsahu

Strany 1 - Ordering Information

General DescriptionThe MAX7446 4-channel, buffered video reconstructionfilter is ideal for anti-aliasing and DAC-smoothing videoapplications or wherev

Strany 2 - ELECTRICAL CHARACTERISTICS

MAX74464-Channel Video Filter for RGB and CVBS Video2 _______________________________________________________________________________________ABSOLUTE

Strany 3 - MAX7446 toc02

MAX74464-Channel Video Filter for RGB and CVBS Video_______________________________________________________________________________________ 3AMPLITUDE

Strany 4 - Detailed Description

MAX74464-Channel Video Filter for RGB and CVBS Video4 _______________________________________________________________________________________Pin Descr

Strany 5 - Chip Information

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

Strany 6 - Package Information

MAX74464-Channel Video Filter for RGB and CVBS VideoMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied

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Rainbow-electronics MAX7446 Uživatelský manuál Strana 1

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