Rainbow Electronics MAX9508 - Manual (Page 16)

MAX9508
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
16 ______________________________________________________________________________________
Internal Mode Versus External Mode
Internal Mode
Set the INT/EXT control input low for internal mode. The
MAX9508 processes video signals from an internal
source such as a DVD chip (Figure 7). The 2:1 multi-
plexer selects the video signal on CVBSIN. The
EXTCVBSIN video signal is ignored.
75Ω
CURRENT
DAC
CURRENT
DAC
CURRENT
DAC
DVD CHIP
SVIDEO CHROMA
SVIDEO LUMA
TO Y/C SEPARATION
CVBS
CIN
YIN
EXTCVBSIN
COUT
YOUT
CVBSOUT1
SHDN
INT/EXT
LOGIC
LOW
ACTIVE VIDEO
DETECT
SMARTSLEEP
CVBSIN
CVBSOUT2
LPF
CONTROL
LOGIC
MICROCONTROLLER
TO TFT LCD
TO TFT LCD
+3.3V
GND
+3.3V
0.1µF
V DD
CLAMP
OFF
BUFFER
LOAD SENSE
6dB
75Ω
75Ω
75Ω
LPF
BUFFER
LOAD SENSE
BUFFER
6dB
LOAD SENSE
6dB
75Ω
LOAD SENSE
6dB
75Ω
LPF
MAX9508
0.1µF
13mA QUIESCENT
SUPPLY CURRENT
Figure 7. Internal Mode Operation