Rainbow-electronics MAX9508 Instrukcja Użytkownika Pobierz pdf (Strona 1)

General Description

The MAX9508 video filter amplifier with SmartSleep™

and bidirectional video support is ideal for set-top

boxes (STBs), portable DVD players, and portable

media players (PMPs). The inputs can be directly con-

nected to the digital-to-analog converter (DAC) outputs.

The reconstruction filter removes high-frequency sig-

nals above 6.75MHz. The amplifiers have 6dB of gain,

and the outputs can be DC-coupled to a load of 75Ω,

which is equivalent to two video loads, or it can be

AC-coupled to a load of 150Ω.

The SmartSleep circuitry intelligently reduces power

consumption based on the presence of the input signal

and the output loads. When the MAX9508 does not

detect the presence of sync on the input video signal,

the supply current is reduced to less than 7µA. The

device only enables a video amplifier when there is an

active video input signal and an attached load. The

video amplifier remains on while a load is connected. If

the load is disconnected, the video amplifier is turned off.

The MAX9508 contains three reconstruction filters, four

video amplifiers, and a pulldown switch at one of the

two CVBS outputs. The MAX9508 has the ability to con-

trol the bidirectional video signals at the CVBS video

connections without the need for separate switches or

relays. This feature is particularly useful for portable

DVD players, which often use the same connector to

drive a composite video output and to accept an exter-

nal video signal to display on the LCD panel.

The MAX9508 operates from a 2.7V to 3.6V single supply

and is offered in a small 16-pin TQFN (3mm x 3mm)

package. The device is specified over the -40°C to

+125°C automotive temperature range.

Applications

Set-Top Boxes (STBs)

Portable Set-Top Boxes/

Personal Video Recorders (PVRs)

Portable Media Players (PMPs)

Portable DVD Players

Portable Applications

Features

 SmartSleep Feature Detects Input Signal and

Output Load Status to Reduce Power

Consumption

 Triple Standard-Definition Video Reconstruction

Filters with 6.75MHz Passband

 Luma, Chroma, and Composite Inputs

 Luma, Chroma, and Two Composite Outputs

 Integrated Support for a Bidirectional Composite

Video Signal

 Supports Two Video Loads at Each Output

(DC-Coupled)

 2.7V to 3.6V Single-Supply Operation

MAX9508

Video Filter Amplifier with SmartSleep and

Bidirectional Video Support

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-0531; Rev 0; 5/06

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 PIN-PACKAGE PKG CODE TOP MARK

MAX9508ATE+

16 TQFN-EP**

(3mm x 3mm)

T1633-4 AEM

MAX9508AEE+* 16 QSOP E16-4 —

Block Diagrams

Note: All devices are specified over the -40°C to +125°C operat-

ing temperature range.

Denotes lead-free package.

Future product—contact factory for availability.

EP = Exposed pad.

SmartSleep is a trademark of Maxim Integrated Products, Inc.

Pin Configurations appear at end of data sheet.

CIN

YIN

EXTCVBSIN

COUT

YOUT

CVBSOUT1

SHDN

INT/EXT

ACTIVE VIDEO

DETECT

SMARTSLEEP

CVBSIN

CVBSOUT2

LPF

CONTROL

LOGIC

CLAMP

BUFFER

LOAD SENSE

6dB

LPF

BUFFER

LOAD SENSE

BUFFER

6dB

LOAD SENSE

6dB

LOAD SENSE

6dB

LPF

MAX9508

Block Diagrams continued at end of data sheet.

1 2 3 4 5 6 ... 24 25

Bidirectional Video Support 1

Podsumowanie treści

Strona 1 - Bidirectional Video Support

General DescriptionThe MAX9508 video filter amplifier with SmartSleep™and bidirectional video support is ideal for set-topboxes (STBs), portable DVD p

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Detailed DescriptionIn the typical application circuit for a portable DVDplayer (Figure 1), the current DACs on a DVD decoderchip generate video signa

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MAX9508Video Filter Amplifier with SmartSleep andBidirectional Video Support__________________________________________________________________________

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MAX9508Active-Detect ModeThe active video-detect circuit slices the CVBSIN signalat 4.7% of the power supply (155mV for a 3.3V supply).If the transiti

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Full-Operation ModeIf a load is connected to an output, the correspondingfilter and amplifier turn on and remain on until the out-put load is disconne

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MAX9508Video Filter Amplifier with SmartSleep andBidirectional Video Support14 _______________________________________________________________________

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MAX9508Video Filter Amplifier with SmartSleep andBidirectional Video Support__________________________________________________________________________

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MAX9508Video Filter Amplifier with SmartSleep andBidirectional Video Support16 _______________________________________________________________________

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External ModeSet the INT/EXT control input high for external mode.The 2:1 multiplexer selects the video signal onEXTCVBSIN (Figure 8). The YIN, CIN, a

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MAX9508InputsThe MAX9508 video inputs YIN, CIN, and CVBSINshould be directly connected to the output of the videocurrent DAC. DC-coupling ensures that

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Video Reconstruction FilterThe MAX9508 filter passband is 6.75MHz, which makesthe device suitable for the higher bandwidth video sig-nals from a DVD c

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MAX9508Video Filter Amplifier with SmartSleep andBidirectional Video Support2 ________________________________________________________________________

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MAX9508Power-Supply Bypassing and GroundThe MAX9508 operates from a single-supply voltagedown to 2.7V, allowing for low-power operation. BypassVDDto G

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MAX9508Video Filter Amplifier with SmartSleep andBidirectional Video Support__________________________________________________________________________

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MAX9508Video Filter Amplifier with SmartSleep andBidirectional Video Support__________________________________________________________________________

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MAX9508Video Filter Amplifier with SmartSleep andBidirectional Video Support24 _______________________________________________________________________

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MAX9508Video Filter Amplifier with SmartSleep andBidirectional Video SupportMaxim cannot assume responsibility for use of any circuitry other than cir

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MAX9508Video Filter Amplifier with SmartSleep andBidirectional Video Support__________________________________________________________________________

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MAX9508Video Filter Amplifier with SmartSleep andBidirectional Video Support4 ________________________________________________________________________

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MAX9508Video Filter Amplifier with SmartSleep andBidirectional Video Support__________________________________________________________________________

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MAX9508Video Filter Amplifier with SmartSleep andBidirectional Video Support6 ________________________________________________________________________

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MAX9508Video Filter Amplifier with SmartSleep andBidirectional Video Support__________________________________________________________________________

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MAX9508Video Filter Amplifier with SmartSleep andBidirectional Video Support8 ________________________________________________________________________

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MAX9508Video Filter Amplifier with SmartSleep andBidirectional Video Support__________________________________________________________________________

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