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LM1246NA データシート(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部品番号 LM1246NA
部品情報  150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs
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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)

LM1246NA データシート(HTML) 11 Page - National Semiconductor (TI)

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Pin Descriptions and Application Information (Continued)
Pin
No.
Pin Name
Schematic
Description
3V
REF
External resistor, 10k 1%, sets the internal bias
current level for optimum performance of the
LM1247. This resistor should be placed as close
to pin 3 and the pin 4 ground return as possible.
4
Analog Input
Ground
This is the ground for the input analog portions
of the LM1247 internal circuitry.
5
6
7
Blue Video In
Red Video In
Green Video In
These video inputs must be AC coupled with a
.0047 µF cap. Internal DC restoration is done at
these inputs. A series resistor of about 33
Ω and
external ESD protection diodes should also be
used for protection from ESD damage.
8
10
Digital Ground
PLL V
CC
The ground pin should be connected to the rest
of the circuit ground by a short but independent
PCB trace to prevent contamination by
extraneous signals. The V
CC pin should be
isolated from the rest of the V
CC line by a ferrite
bead and bypassed to pin 8 with an electrolytic
capacitor and a high frequency ceramic.
9
PLL Filter
Recommended topology and values are shown
to the left. It is recommended that both filter
branches be bypassed to the independent
ground as close to pin 8 as possible. Great care
should be taken to prevent external signals from
coupling into this filter from video, I
2C, etc.
11
SDA
The I
2C compatible data line. A pull-up resistor
of about 2 k
Ω should be connected between this
pin and V
CC. A resistor of at least 100
Ω should
be connected in series with the data line for
additional ESD protection.
www.national.com
11


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