LM2467 datasheet(11/43 Pages) NSC

11 / 43 page

Pin Descriptions and Application Information (Continued)

No.

Pin Name

Schematic

Description

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.

Analog Input

Ground

This is the ground for the input analog portions

of the LM1247 internal circuitry.

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.

Digital Ground

Digital V

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.

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.

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.

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