max9508atet Maxim Integrated Products, Inc., max9508atet Datasheet - Page 10

• Manufacturer Part Number: max9508atet
• Description: Max9508 Video Filter Amplifier With Smartsleep And Bidirectional Video Support
• Manufacturer: Maxim Integrated Products, Inc.

In the typical application circuit for a portable DVD
player
chip generate video signals. When the internal signal
sources are selected, the MAX9508 filters those signals
and then drives the video connectors through a 75Ω
back termination resistor. When external video sources
are selected, the MAX9508 selects the external com-
posite video signal (EXTCVBSIN), filters, and amplifies
it. The output stages of the amplifiers connected to
CVBS/S-Video Filter Amplifier with
SmartSleep and Bidirectional Video Support
Figure
10
______________________________________________________________________________________
1. Typical Application Circuit for Portable DVD Player
(Figure
MICROCONTROLLER
CURRENT
CURRENT
CURRENT
DVD CHIP
DAC
DAC
DAC
1), the current DACs on a DVD decoder
Detailed Description
+3.3V
0.1μF
SMARTSLEEP
EXTCVBSIN
INT/EXT
CVBSIN
SHDN
CIN
YIN
CLAMP
BUFFER
BUFFER
ACTIVE VIDEO
CONTROL
DETECT
BUFFER
LOGIC
LPF
LPF
LPF
MAX9508
+3.3V
GND
V
COUT, YOUT, and CVBSOUT1 become high imped-
ance. The n-channel switch at CVBSOUT1 turns on,
thereby converting the back termination resistor into an
input termination resistor.
The SmartSleep feature is activated when the SMARTSLEEP
input is connected to logic high. The SmartSleep feature
provides intelligent power management by selectively
disabling the filters and output amplifiers based on
the presence of video signals or loads attached to the
DD
0.1μF
6dB
6dB
6dB
6dB
LOAD SENSE
LOAD SENSE
LOAD SENSE
LOAD SENSE
YOUT
CVBSOUT1
CVBSOUT2
COUT
SmartSleep Feature
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
TO Y/C SEPARATION
TO TFT LCD
TO TFT LCD
SVIDEO CHROMA
CVBS
SVIDEO LUMA