Rainbow-electronics MAX7457 Bedienungsanleitung PDF herunterladen (Seite 1)

General Description

The MAX7457 4-channel video switch is ideal for anti-

aliasing and DAC-smoothing video applications or wher-

ever analog video is reconstructed from a digital data

stream such as cable/satellite/terrestrial set-top boxes

(STBs), DVD players, hard disk recorders (HDRs), and

personal video recorders (PVRs). The MAX7457 filters

and buffers CVBS and RGB video signals, making it

ideal for dual SCART (peritelevision) STBs with an

auxiliary CVBS input. The MAX7457 operates from a sin-

gle +5V supply and has a flat passband out to 5MHz

with a stopband attenuation of 43dB at 27MHz, making

it ideal for NTSC, PAL, and standard-definition digital TV

(SDTV) video systems.

The MAX7457 output buffers have a fixed gain of +6dB

and are capable of driving two standard 150Ω video

loads. The channel for CVBS video has high-frequency

boost circuitry that enhances picture sharpness with up

to +1.2dB of gain boost without degradation in the

stopband. The video output drivers can be disabled by

an external control input.

The MAX7457 is available in a 16-pin, 5mm x 5mm x

0.8mm TQFN package, and is specified over the

extended (-40°C to +85°C) temperature range.

Applications

STBs/HDRs DVD Players

Game Consoles Digital VCRs

Desktop Video Editors

Features

♦ 4-Channel Video Filter/Buffer for RGB and CVBS

Signals with Auxiliary Input

♦ Allows Auxiliary Input for CVBS Video Loop-

Through Applications

♦ 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 Operation

♦ Available in 5mm x 5mm x 0.8mm, 16-Pin TQFN

MAX7457

Video Switch for Dual SCART Connectors

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

MAX7457

75Ω

OUTA

+6dB

75Ω

*OPTIONAL CAPACITORS

75Ω

OUTB

+6dB

75Ω

OUTC

+6dB

75Ω

OUTD

+6dB

SYNC

DETECTOR

LOWPASS

FILTER

LOWPASS

FILTER

LOWPASS

FILTER

LOWPASS

FILTER

2-TO-1

MUX

GND

DISABLE

SELA

0.1µF

INA2

0.1µF

INA1

0.1µF

INB

0.1µF

INC

0.1µF

IND

D/A

AUXILIARY VIDEO SOURCE

(VCR, DVD, ETC.)

ENCODER

CVBS

Typical Operating Circuit

19-3560; Rev 0; 1/05

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.

Pin Configuration appears at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

PKG

CODE

MAX7457ETE -40°C to +85°C 16 TQFN-EP* T1655-2

*EP = Exposed pad.

1 2 3 4 5 6 7 8

Inhaltsverzeichnis

Seite 1 - Typical Operating Circuit

General DescriptionThe MAX7457 4-channel video switch is ideal for anti-aliasing and DAC-smoothing video applications or wher-ever analog video is rec

Seite 2 - ELECTRICAL CHARACTERISTICS

MAX7457Video Switch for Dual SCART Connectors2 _______________________________________________________________________________________ABSOLUTE MAXIMUM

Seite 3 - PHASE RESPONSE vs. FREQUENCY

MAX7457Video Switch for Dual SCART Connectors_______________________________________________________________________________________ 3ELECTRICAL CHARA

Seite 4 - = +5V, T

MAX7457Video Switch for Dual SCART Connectors4 _______________________________________________________________________________________GROUP DELAY vs.

Seite 5 - Detailed Description

MAX7457Video Switch for Dual SCART Connectors_______________________________________________________________________________________ 5Pin DescriptionP

Seite 6 - Pin Configuration

MAX7457Output BuffersEach output buffer has a fixed gain of +6dB and candrive two 150Ω video loads with a 2VP-Psignal. TheMAX7457 can drive an AC-coup

Seite 7 - Package Information

MAX7457Video Switch for Dual SCART Connectors_______________________________________________________________________________________ 7Package Informat

Seite 8 - QFN THIN.EPS

MAX7457Video Switch for Dual SCART ConnectorsMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a M

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Rainbow-electronics MAX7457 Bedienungsanleitung Seite 1

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Rainbow-electronics MAX7457 Bedienungsanleitung Seite 1

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