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LM1247 bảng dữ liệu(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện LM1247
Giải thích chi tiết về linh kiện  150 MHz I2C Compatible RGB Preamplifier with Internal 512 Character OSD ROM, 512 Character RAM and 4 DACs
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1247 bảng dữ liệu(HTML) 9 Page - National Semiconductor (TI)

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Typical Performance Characteristics V
CC =5V, TA = 25˚C unless otherwise specified (Continued)
TABLE 3. OSD Register recommendations
PPL=0
PPL=1
PPL=2
PPL=3
PPL=4
PPL=5
PPL=6
PPL=7
PLL=1
25 - 61
25 - 53
25 - 48
25 - 43
25 - 40
25 - 36
25 - 34
25 - 31
PLL=2
NR
NR
48 - 98
43 - 88
40 - 81
36 - 74
34 - 69
31 - 64
PLL=3
NR
NR
NR
88 - 110
81 - 110
74 - 110
69 - 110
64 - 110
Pin Descriptions and Application Information
Pin
No.
Pin Name
Schematic
Description
1
V Flyback
Required for OSD synchronization and is also
used for vertical blanking of the video outputs.
The actual switching threshold is about 35% of
V
CC. For logic level inputs C4 can be a jumper,
but for flyback inputs, an AC coupled
differentiator is recommended, where R
V is large
enough to prevent the voltage at pin 1 from
exceeding V
CC or going below GND. C4 should
be small enough to flatten the vertical rate ramp
at pin 1. C
24 may be needed to reduce noise.
2V
REF Bypass
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 2 and the pin 4 ground return as
possible.
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.
www.national.com
9


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