MAX9508 Datasheet, PDF (1/25 Pages) Maxim Integrated Products – Video Filter Amplifier with SmartSleep and Bidirectional Video Support

19-0531; Rev 0; 5/06
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
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.
Features
o SmartSleep Feature Detects Input Signal and
Output Load Status to Reduce Power
Consumption
o Triple Standard-Definition Video Reconstruction
Filters with 6.75MHz Passband
o Luma, Chroma, and Composite Inputs
o Luma, Chroma, and Two Composite Outputs
o Integrated Support for a Bidirectional Composite
Video Signal
o Supports Two Video Loads at Each Output
(DC-Coupled)
o 2.7V to 3.6V Single-Supply Operation
Ordering Information
PART
PIN-PACKAGE PKG CODE TOP MARK
MAX9508ATE+
16 TQFN-EP**
(3mm x 3mm)
T1633-4
AEM
MAX9508AEE+* 16 QSOP
E16-4
—
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.
Block Diagrams
BUFFER
CIN
LPF
LOAD SENSE
6dB
COUT
Applications
Set-Top Boxes (STBs)
Portable Set-Top Boxes/
Personal Video Recorders (PVRs)
Portable Media Players (PMPs)
Portable DVD Players
Portable Applications
Pin Configurations appear at end of data sheet.
SmartSleep is a trademark of Maxim Integrated Products, Inc.
YIN
INT/EXT
SMARTSLEEP
SHDN
CVBSIN
EXTCVBSIN
BUFFER
LPF
LOAD SENSE
6dB
YOUT
CONTROL
LOGIC
ACTIVE VIDEO
DETECT
MAX9508
LOAD SENSE
6dB
CVBSOUT1
BUFFER
LPF
CLAMP
LOAD SENSE
6dB
CVBSOUT2
Block Diagrams continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
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.