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LM1270 データシート(PDF) 7 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1270
部品情報  Hi-Brite 200 MHz I2C Compatible RGB Image Enhancer with Video Auto Sizing
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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)

LM1270 データシート(HTML) 7 Page - National Semiconductor (TI)

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Pin Descriptions (Continued)
Pin
No.
Pin Name
Schematic
Description
17
18
Ground
V
CC
Ground pin for the output analog portion of the
LM1270 circuitry, and power supply pin for all the
analog of the LM1270. Note the recommended
charge storage and high frequency capacitors which
should be as close to pins 17 and 18 as possible.
19
20
21
Green Video Out
Red Video Out
Blue Video Out
Video outputs of the LM1270. Typically the output is
set to 0.7 V
P-P to drive any standard video pre-amp.
When Hi-Brite is activated the user can set the
video output as high as 1.0 V
P-P.
22
V
REF Cap
Provides filtering for the internal voltage which sets
the internal bias current in conjunction with R
EXT.A
minimum of 0.1 µF is recommended for proper
filtering. This capacitor should be placed as close to
pin 22 and the analog ground return as possible.
This pin can also be set to use an external V
REF.
23
V
REFREXT
Sets the internal current sources through a
10 k
Ω 1% external resistor. Resistor value and
accuracy is critical for optimum operation of the
LM1270. This resistor should be placed as close to
pin 23 and the analog ground return as possible.
24
Clamp
This pin can either accept an external clamp pulse
or send an internally generated clamp pulse to the
video circuits. As an input this pin accepts either
TTL or CMOS logic levels. The internal switching
threshold is approximately one-half of V
CC.An
external series resistor, R
CLP, of about 1 k
Ω is
recommended to avoid overdriving the input
devices, or for current limiting the drivers if being
used as an output. C
CLP may be necessary for
filtering noise on the clamp input. R
LOAD should be
used if this pin is an output with a value of about
10 k
Ω.
www.national.com
7


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