Rainbow-electronics MAX7439 Bedienungsanleitung PDF herunterladen

General Description

The MAX7438/MAX7439 three-channel standard defini-

tion video reconstruction filters include a back-porch

clamp that sets the output blanking level of the video

signal to ground. Each channel of the MAX7438/

MAX7439 combines a lowpass filter with adjustable

high-frequency boost levels and an output buffer capa-

ble of driving two standard 150Ω video loads. The

blanking level of the output video signal on each chan-

nel is clamped to ground, eliminating the need for large

AC-coupling output capacitors. Direct input coupling

circuitry eliminates the need for AC-coupling input

capacitors. This DC-in/DC-out architecture results in

extremely low line-time distortion. The MAX7438/

MAX7439 are ideal for antialiasing and DAC smoothing

in digital video devices such as STBs, DVDs, PVRs,

and hard disk recorders. The MAX7438/MAX7439 oper-

ate from ±5V dual supplies.

The three-channel MAX7438/MAX7439 are ideal for Y,

, P

, and RGB component video signals, three com-

posite video signals, and also Y/C plus CVBS video sig-

nals. Each filter channel achieves 60dB of attenuation at

27MHz and a maximally flat passband from DC to 5MHz.

The MAX7438 offers an internal gain of +2V/V, while the

MAX7439 offers a gain of +3V/V.

Applications

Features

♦ Back-Porch of Video Output Signal Clamped to

Ground

♦ Eliminates Input/Output AC-Coupling Capacitors

♦ 0.1% Line-Time Distortion

♦ Stopband: 55dB at 27MHz

♦ Passband: ±0.8dB out to 5MHz

♦ Diff Gain = 0.05%, Diff Phase = 0.05 Degrees

♦ Output Clamped to Ground with Loss of Input

♦ Each Output Drives Two 150Ω Video Loads

♦ Up to 2dB of High-Frequency Boost Control

♦ Ideal for CVBS, Y/C (S-Video), and RGB (Y, P

)

Outputs for NTSC, PAL, and SDTV

♦ Filter Bypass Mode

♦ Small 20-Pin 5mm

5mm Thin QFN Package

MAX7438/MAX7439

Triple-Channel Video Reconstruction Filters with

Back-Porch Clamp to GND

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-2857; Rev 0; 4/03

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.

PART TEMP RANGE PIN-PACKAGE

MAX7438ETP -40°C to +85°C 20 Thin QFN-EP*

MAX7439ETP -40°C to +85°C 20 Thin QFN-EP*

*EP = Exposed paddle

Pin Configuration appears at end of data sheet.

EVALUATION KIT

AVAILABLE

IN1

IN2

IN3

MAX7438

MAX7439

ENCODER

= -5VV

= +5V

EXT

10kΩ

GND

BACK-PORCH

DETECTOR

HIGH-FREQUENCY

BOOST CONTROL/

BYPASS

BIAS

GENERATOR

DAC2

LOWPASS

FILTER

DAC3

HFB1

HFB2

HFB3

DAC1

OUT1

= 75Ω

75Ω

= 75Ω

75Ω

GAIN/LEVEL

SHIFT

LOWPASS

FILTER

LOWPASS

FILTER

OUT2

= 75Ω

75Ω

= 75Ω

75Ω

OUT3

= 75Ω

75Ω

= 75Ω

75Ω

GAIN/LEVEL

SHIFT

GAIN/LEVEL

SHIFT

Functional Diagram

Set-Top Boxes/HDR/DVD

Game Consoles

Camcorders

Composite, Component,

S-Video Output for

NTSC, PAL, SDTV

1 2 3 4 5 6 7 8 9 10

Inhaltsverzeichnis

Seite 1 - Back-Porch Clamp to GND

General DescriptionThe MAX7438/MAX7439 three-channel standard defini-tion video reconstruction filters include a back-porchclamp that sets the output

Seite 2

MAX7438/MAX7439Triple-Channel Video Reconstruction Filters withBack-Porch Clamp to GNDMaxim cannot assume responsibility for use of any circuitry othe

Seite 3

MAX7438/MAX7439Triple-Channel Video Reconstruction Filters withBack-Porch Clamp to GND2 ______________________________________________________________

Seite 4

MAX7438/MAX7439Triple-Channel Video Reconstruction Filters withBack-Porch Clamp to GND________________________________________________________________

Seite 5

MAX7438/MAX7439Triple-Channel Video Reconstruction Filters withBack-Porch Clamp to GND4 ______________________________________________________________

Seite 6

MAX7438/MAX7439Triple-Channel Video Reconstruction Filters withBack-Porch Clamp to GND________________________________________________________________

Seite 7

MAX7438/MAX7439Detailed DescriptionFilterFilter ResponseThe MAX7438/MAX7439 reconstruction filters consist ofthree separate lowpass filters with Butte

Seite 8

external resistors form a voltage-divider between VCCand GND. The values in the fourth column (VHFB_(V))are calculated using the following equation:VH

Seite 9

MAX7438/MAX7439Microprocessor Control of High-FrequencyBoost and BypassUse a DAC output to control the bypass and high-fre-quency boost levels on each

Seite 10

MAX7438/MAX7439Triple-Channel Video Reconstruction Filters withBack-Porch Clamp to GND________________________________________________________________

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Rainbow-electronics MAX7439 Bedienungsanleitung

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Inhaltsverzeichnis

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