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Rainbow Electronics MAX9508 User Manual

General description, Applications, Features

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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

1

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.