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MAX7474 Evaluation Kit
Back-Porch DC Level (BPLVL)
The MAX7474 EV kit provides an option to set the
back-porch DC level for the video output signal.
Jumper JU3 selects the voltage source that sets the
back-porch DC level for the MAX7474 BPLVL pin. See
RJ-45 Connector Pin Configuration (VIN)
The MAX7474 EV kit provides an RJ-45 connector to
accept a differential video input signal at the VIN RJ-
45 connector. Table 4 lists the RJ-45 connector pin
configuration.
Table 2 for shunt positions.
Table 4. RJ-45 Connector Pin
Table 2. JU3 Jumper Selection (BPLVL)
Configuration (VIN)
SHUNT
POSITION
1-2*
MAX7474 BPLVL PIN
Connected to U2, pin 5
(through potentiometer
R4; 1.4V default)
BACK-PORCH DC
LEVEL
0 to 2.5V (set by
potentiometer R4)
RJ-45 (VIN) PIN
1–6
7
8
SIGNAL
No connection
V_INN
V_INP
2-3
Connected to BP_LVL
BNC connector
External reference
source
Header J1 (LOB, LOS)
The MAX7474 EV kit provides a 3-pin header to access
*Default position.
Output Coupling (VOUT)
The MAX7474 EV kit provides an option to select the
output coupling of the video output signal on the
MAX7474 EV kit for AC- or DC-coupling. Jumper JU4
selects the output coupling for the MAX7474 output.
See Table 3 for shunt positions.
Table 3. JU4 Jumper Selection (VOUT)
the LOB and LOS status output signals and GND. The
LOB outputs a logic-high when the color burst portion
of the video signal is not detected at the input.
Similarly, the LOS outputs a logic-high when the sync
signal of the video signal is not detected at the input.
Table 5 lists the header J1 pinout.
Table 5. Header J1 Pinout (LOB, LOS,
GND)
SHUNT POSITION
Installed
Not installed*
*Default position.
MAX7474 OUTPUT
DC-coupled
AC-coupled
HEADER
J1 PIN
1
2
3
SIGNAL LEVEL
LOB = high
LOB = low
LOS = high
LOS = low
GND
FUNCTION
No color burst
Color burst detected
No sync signal
Sync signal detected
GND
_______________________________________________________________________________________
3
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