Pin Descriptions

Pin No.

Pin Name

Schematic

Description

1

2

3

Red OSD Input

Green OSD Input

Blue OSD Input

These inputs accept standard TTL inputs. Each

color is either fully on (logic high) or fully off

(logic low). Connect unused pins to ground

with a 47k resistor.

4

Video/OSD Switch

This input accepts a standard TTL input.

H = OSD

L = Video

Connect to ground with a 47k resistor when

not using OSD.

DS012684-12

Ω resistor for protection against EOS (Electrical Over Stress). If the OSD input signals are external to the monitor,

or these signals are present any time when +12V is not fully powered up, then the OSD inputs also require a series 33

Ω resistor.

FIGURE 7. LM1283 OSD Video Preamp Demonstration Board Schematic

www.national.com

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