LM1269 datasheet(10/20 Pages) NSC

Il numero della parte	LM1269

Spiegazioni elettronici	110 MHz I2C Compatible RGB Video Amplifier System with OSD & DACs

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Produttore elettronici	NSC [National Semiconductor (TI)]

Homepage	http://www.national.com

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10 / 20 page

Pin Descriptions (Continued)

Pin No.

Pin Name

Schematic

Description

18

19

20

Blue Video Out

Green Video Out

Red Video Out

Video outputs of the LM1269. The ideal

driver for this part is the LM246X CRT driver

family, which has the necessary gain of 26

dB or 20 V/V.

21

V

Ref Out

A 0.1 µF capacitor must be placed close to

this pin for decoupling the internal V

Ref. This

pin may be used for an external voltage

reference with proper buffering.

22

ABL

The Auto Beam Limit control reduces the

gain of the video amplifier in response to a

control voltage proportional to the CRT beam

current. The ABL acts identically on all three

channels. ABL is required for CRT life and

X-ray protection.

23

Clamp Pulse

This input accepts a standard TTL or CMOS

input. A positive signal activates the clamp

pulse for DC restoration of the video input.

The AC coupling capacitors at the video

inputs are used for holding the DC correction

voltage, eliminating the need for additional

capacitors.

24

H Flyback

H flyback is an analog signal input from the

monitor horizontal scan. The LM1269 is able

to generate an accurate blanking pulse in

the video outputs from this input. The

horizontal flyback from the monitor must be

a clean signal, with no ringing or other noise

on the signal.

www.national.com

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