CVBS Video Filter Amplifier with SmartSleep

and Bidirectional Video Support

16

______________________________________________________________________________________

Y/C SEPARATION

CVBS1

EXTCVBSIN

CVBSOUT1

SHDN

INT/EXT

LOGIC-

LOW

ACTIVE VIDEO

DETECT

SMARTSLEEP

CVBSIN

CVBSOUT2

CONTROL

LOGIC

+3.3V

GND

+3.3V

0.1

μF

CLAMP

OFF

75

Ω

BUFFER

LOAD SENSE

6dB

75

Ω

LOAD SENSE

6dB

LPF

MAX9513

0.1

μF

11.6mA PLUS

LOAD CURRENT

CURRENT

DAC

DVD CHIP

MICROCONTROLLER

Figure 7. Internal Mode Operation for Portable DVD Application

Internal Mode Versus External Mode

Internal Mode

Set the INT/EXT control input low for internal mode. The

MAX9513 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.

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 CVBSIN signal is ignored.

The block drawing of the MAX9513 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.