MAX9508_09 Datasheet, PDF (1/25 Pages) Maxim Integrated Products – CVBS/S-Video Filter Amplifier with SmartSleep and Bidirectional Video Support

19-0531; Rev 2; 1/09
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CVBS/S-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 connected
to the digital-to-analog converter (DAC) outputs. The
reconstruction filter removes high-frequency signals
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
Portable DVD Players
Set-Top Boxes (STBs)
Portable Set-Top Boxes/
Personal Video Recorders (PVRs)
Portable Media Players (PMPs)
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
Ordering Information
PART
PIN-PACKAGE
TOP MARK
MAX9508ATE+
16 TQFN-EP*
(3mm x 3mm)
AEM
Note: Device is specified over the -40°C to +125°C operating
temperature range.
+Denotes lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Block Diagrams
CIN
YIN
INT/EXT
SMARTSLEEP
SHDN
CVBSIN
EXTCVBSIN
BUFFER
LPF
BUFFER
LPF
LOAD SENSE
6dB
COUT
LOAD SENSE
6dB
YOUT
CONTROL
LOGIC
ACTIVE VIDEO
DETECT
MAX9508
LOAD SENSE
6dB
CVBSOUT1
BUFFER
LPF
CLAMP
LOAD SENSE
6dB
CVBSOUT2
Pin Configurations appear at end of data sheet.
Block Diagrams continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.