max9513atet Maxim Integrated Products, Inc., max9513atet Datasheet - Page 10

• Manufacturer Part Number: max9513atet
• Description: Max9513 Cvbs Video Filter Amplifier With Smartsleep And Bidirectional Video Support
• Manufacturer: Maxim Integrated Products, Inc.

In the typical application circuit shown in Figure 1, the
current DAC generates an internal video signal. When the
internal signal source is selected, the MAX9513 filters the
signal and then drives the video connectors through a
75Ω back termination resistor. When the external video
source is selected, the MAX9513 selects the external
video signal (EXTCVBSIN), then clamps, filters, and
amplifies it. The output stage of the amplifier connected
to CVBSOUT1 becomes high impedance. The n-channel
switch at CVBSOUT1 turns on, thereby converting the
back termination resistor into an input termination resistor.
CVBS Video Filter Amplifier with SmartSleep
and Bidirectional Video Support
Figure 1. Typical Application Circuit for Portable DVD Player
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MICROCONTROLLER
CURRENT
DVD CHIP
DAC
CVBS SIGNAL
0.1µF
+3.3V
Detailed Description
+3.3V
SMARTSLEEP
EXTCVBSIN
INT/EXT
CVBSIN
SHDN
CLAMP
ACTIVE VIDEO
CONTROL
DETECT
BUFFER
LOGIC
LPF
+3.3V
GND
V
DD
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
outputs. If the SmartSleep feature is not activated and
the part is not in shutdown, the filters and output ampli-
fiers completely turn on, regardless of whether there is
a video signal at the CVBSIN input and whether there
are loads connected at the outputs. SmartSleep only
works with DC-coupled loads.
0.1µF
6dB
6dB
MAX9513
LOAD SENSE
LOAD SENSE
CVBSOUT1
CVBSOUT2
SmartSleep Feature
75Ω
75Ω
TO Y/C SEPARATION
CVBSOUT/IN