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LM1282 データシート(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1282
部品情報  110 MHz RGB Video Amplifier System with On Screen Display (OSD)
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メーカー  NSC [National Semiconductor (TI)]
ホームページ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1282 データシート(HTML) 10 Page - National Semiconductor (TI)

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Pin Descriptions
Pin
Pin
Schematic
Description
No.
Name
1
2
3
Red OSD Input
Green OSD Input
Blue OSD Input
These inputs accept standard TTL inputs. Each color is either
fully on (logic high) or fully off (logic low). Connect unused
pins to ground with a 47k resistor.
4
Video/OSD Switch
This input accepts a standard TTL input.
H = OSD
L = Video
Connect to ground with a 47k resistor when not using OSD.
5
8
11
Red Video In
Green Video In
Blue Video In
Video inputs. These inputs must be AC Coupled with a
minimum of a 1 µF cap, 10 µF is perferred. DC restoration is
done at these inputs. A series resistor of about 33
Ω should
also be used.
6
9
V
CC1
Power supply pins (excluding output stage)
7
10
21
Ground
Ground pins. All grounds are internally connected and must
also be connected on the PCB.
12
V
REF
Pin used for additional filter capacitor to internal reference.
The voltage at this pin is 2.0V.
13
14
26
27
28
Video Contrast
OSD Contrast
Blue Drive
Green Drive
Red Drive
Contrast control pins:
4V — no attenuation
0V — over 60 dB attenuation
Drive control pins:
4V — no attenuation
0V — 12 dB attenuation
15
16
Clamp Gate
Blank Gate
Both pins accept TTL inputs and are active low. The clamp
gate provides DC restoration of the video signal. The blank
gate forces the video outputs to below 200 mV.
17
19
24
Blue Clamp Cap
Green Clamp Cap
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.
www.national.com
10


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