Mitsubishi DPLUS 74SB -BKA Service Manual page 139

Pin Descriptions
Pin No. Pin Name
5 Red Video Input
6 Green Video Input
7 Blue Video Input
8 Analog Ground
9 V
cc
10 V R
ref ext
11 SDA
12 SCL
13 DAC4
14 DAC3
15 DAC2
16 DAC1
17 Digital Ground
Schematic
7-38
Description
Video inputs. These inputs must be AC
coupled with a 0.047 µF cap. DC restoration
is done at these inputs. A series resistor of
about 33 Ω and external ESD protection
diodes should also be used for ESD
protection.
Ground Pin for the analog circuits of the
LM1269.
Power supply pin for LM1269.
Sets the internal current sources through a
10 k Ω 1% external resistor. Resistor value
and accuracy is critical for optimum
operation of the LM1269.
The I²C data line. A pull-up resistor of about
2k Ω should be connected between this pin
and +5V. A 300 Ω resistor should be
connected in series with the data line for
protection against arcing.
The I²C Clock line. A pull-up resistor of
about 2k Ω should be connected between
this pin and +5V. A 300 Ω resistor should be
connected in series with the clock line for
protection against arcing.
DAC outputs for cathode cut-off adjustments
and brightness control. DAC 4 can be set to
change the outputs of the other three DACs,
acting as the brightness control. The DACS
are set through the I²C bus.
Ground Pin for the digital circuits of the
LM1269.