LM1276 datasheet(13/50 Pages) NSC

13 / 50 page

Typical Performance Characteristics V

CC =5V, TA = 25˚C unless otherwise specified (Continued)

TABLE 2. OSD Register Recommendations

PPL=0

PPL=1

PPL=2

PPL=3

PPL=4

PPL=5

PPL=6

PPL=7

PLL Auto

25 - 61

25 - 53

25 - 98

25 - 110

25 - 108

25 - 102

25 - 96

Pin Descriptions and Application Information

No.

Pin Name

Schematic

Description

V Sync

Logic level vertical sync signal received from the

video card in the PC or sync stripper circuit.

Analog V

Analog Ground

Ground pin and power supply pin for the input

analog portion of the LM1276. Note the

recommended charge storage and high

frequency capacitors, which should be as close

to pins 2 and 4 as possible.

REFREXT

External current set resistor, 10k 1%, sets the

internal bias current level for optimum

performance of the LM1276. This resistor should

be placed as close to pin 3 and the pin 4 ground

return as possible.

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.

PLL Ground

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.

LM1276 bảng dữ liệu(PDF) 13 Page - National Semiconductor (TI)

LM1276 bảng dữ liệu(HTML) 13 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

bảng dữ liệu tải về

Link URL