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LM1281N データシート(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1281N
部品情報  85 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)

LM1281N データシート(HTML) 10 Page - National Semiconductor (TI)

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Pin Descriptions
Pin No.
Pin Name
Schematic
Description
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 ofa1µF cap, 10 µF
is preferred. 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 Constrast
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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