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MAX11504 Evaluation Kit
Output Coupling
The MAX11504 EV kit provides an option to configure
the MAX11504 outputs to AC- or DC-coupling. Jumpers
JU12 –JU16 configure the output coupling for the
MAX11504 EV kit. See Table 2 for shunt positions.
Table 2. JU12–JU16 Jumper Selection
DC Bias for YPbPr Signals
When configuring the EV kit video inputs for AC-
coupled operation, the correct DC bias point has to be
chosen, depending on the input signal. Unipolar sig-
nals, such as R, G, B, and Y, are biased correctly using
the MAX11504 internal transparent clamp. For bipolar
signals, such as P B and P R , a constant DC bias voltage
has to be applied after the AC-coupling capacitor to
SHUNT POSITION
Installed
Not installed*
*Default position.
COUPLING
CONFIGURATION
DC-coupling
AC-coupling
make sure that the clamp never operates. A 590mV DC
bias voltage can be applied by installing shunts across
jumpers JU5–JU8. To configure the inputs to a different
DC bias voltage, replace resistors R17–R20. See Table
4 for input clamp configuration.
Output Channel 2, 3, and 4 Load
Table 4. Input Clamp Operation (JU5–JU8)
(OUT_2, OUT_3, OUT_4)
The MAX11504 EV kit provides an option to fully load
the output channels (2, 3, and 4) of the MAX11504.
Jumpers JU9, JU10, and JU11 configure channel 2,
channel 3, and channel 4 output loads, respectively, on
the MAX11504 EV kit. See Table 3 for shunt positions.
Table 3. JU9, JU10, JU11 Jumper
Selection (OUT_2, OUT_3, OUT_4)
OUTPUT LOAD ( Ω )
SHUNT POSITION
Installed
75
Not installed*
150
*Default position.
SHUNT
POSITION
Installed
Not installed*
*Default position.
EV KIT FUNCTION
DC bias enabled: Use for Pb, Pr signals
DC bias disabled: Use for R, G, B, Y signals
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