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LM1279 Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM1279
Description  110 MHz RGB Video Amplifier System with OSD
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM1279 Datasheet(HTML) 6 Page - National Semiconductor (TI)

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Pin Descriptions
Pin
No.
Pin
Name
Schematic
Description
1
Red OSD Input
These are standard TTL inputs. An OSD
signal at any of the three pins will
automatically switch the pre-amp into the
OSD mode. 7 colors, including white, are
available.
19
Blue OSD Input
20
Green OSD Input
2V
CC1
Power supply pin (excluding output stage)
3
Red Video In
Video inputs. These inputs
must be AC
Coupled with a minimum ofa1µF cap, 10
µF is preferred. A series resistor of about
33
Ω must be used for ESD protection.
5
Green Video In
8
Blue Video In
4
Red Clamp Cap
The external clamp cap is charged and
discharged to the correction voltage
needed for DC restoration. 0.1 µF is the
recommended value.
7
Green Clamp Cap
9
Blue Clamp Cap
6
Ground
Ground pin.
10
Contrast
Contrast control pin:
4V - no attenuation
0V - over 40 dB attenuation
Drive control pins:
4V - no attenuation
0V - 20 dB attenuation
12
Blue Drive
14
Green Drive
17
Red Drive
11
Sandcastle Input
The sandcastle input allows for blanking
only, or blanking with DC restoration.
Blanking requires a 2V input. Clamping
with blanking requires a 4V input.
13
Blue Video Out
Video output. For proper black level the
output must drive 390
Ω impedance.
15
Green Video Out
18
Red Video Out
www.national.com
6


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