Rainbow Electronics MAX9508 - Manual (Page 17)

External Mode
Set the INT/EXT control input high for external mode.
The 2:1 multiplexer selects the video signal on
EXTCVBSIN (Figure 8). The YIN, CIN, and CVBSIN sig-
nals are ignored. The block drawing of the MAX9508 in
Figure 8 shows which circuits are off while in external
mode. SmartSleep does not function in external mode,
and the SMARTSLEEP input is ignored.
MAX9508
Video Filter Amplifier with SmartSleep and
Bidirectional Video Support
______________________________________________________________________________________ 17
75Ω
CURRENT
DAC
CURRENT
DAC
CURRENT
DAC
DVD CHIP
SVIDEO CHROMA
SVIDEO LUMA
TO Y/C SEPARATION
CVBS
CIN
YIN
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
EXTCVBSIN
COUT
YOUT
CVBSOUT1
SHDN
INT/EXT
LOGIC
HIGH
ACTIVE VIDEO
DETECT
SMARTSLEEP
CVBSIN
CVBSOUT2
LPF
CONTROL
LOGIC
MICROCONTROLLER
TO TFT LCD
TO TFT LCD
+3.3V
0V OR
+3.3V
GND
+3.3V
V DD
CLAMP
BUFFER
LOAD SENSE
6dB
75Ω
75Ω 75Ω
75Ω
LPF
BUFFER
LOAD SENSE
BUFFER
6dB
LOAD SENSE
6dB
75Ω
LOAD SENSE
6dB
75Ω
LPF
MAX9508
0.1µF
4.3mA QUIESCENT
SUPPLY CURRENT
VIDEO
SOURCE
Figure 8. External Mode Operation