LM1269 National Semiconductor, LM1269 Datasheet - Page 9

• Manufacturer Part Number: LM1269
• Description: 110 MHz I2C Compatible RGB Video Amplifier System with OSD & DACs
• Manufacturer: National Semiconductor

Pin No.
Pin Descriptions
10
11
12
13
14
15
16
17
5
6
7
8
9
Red Video In
Green Video In
Blue Video In
Analog Ground
V
V
SDA
SCL
DAC4
DAC3
DAC2
DAC1
Digital Ground
CC
ref
Pin Name
R
ext
(Continued)
Schematic
9
Video inputs. These inputs must be AC
coupled with a 4.7 nF cap. DC restoration is
done at these inputs. A series resistor of
about 33
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
and accuracy is critical for optimum
operation of the LM1269.
The I
2 k
and +5V. A 300
connected in series with the data line for
protection against arcing.
The I
about 2 k
this pin and +5V. A 300
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 I
Ground Pin for the digital circuits of the
LM1269.
2
2
should be connected between this pin
C data line. A pull-up resistor of about
C Clock line. A pull-up resistor of
1% external resistor. Resistor value
and external ESD protection
should be connected between
Description
resistor should be
2
C bus.
resistor should be
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