LM1238 datasheet(6/24 Pages) NSC

Part #	LM1238

Description	110 MHz I2C Compatible RGB Preamplifier with Internal Simple OSD Generator and 4 DACs

PDF	24 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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6 / 24 page

Typical Performance Characteristics

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

SYSTEM INTERFACE SIGNALS

The Horizontal and Vertical Blanking and the Clamping input

signals are important for proper functionality of the LM1238.

Both blanking inputs must be present for OSD synchroniza-

tion. In addition, the Horizontal blanking input also assists in

setting the proper cathode black level, along with the Clamp-

ing pulse. The Vertical blanking input initiates a blanking

level at the LM1238 outputs which is programmable from 3

to 127 lines (we recommend at least 10). This can be op-

tionally disabled so there is no vertical blanking.

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FIGURE 2. Logic Horizontal Blanking

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FIGURE 3. Logic Vertical Blanking

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FIGURE 4. Deflection Horizonal Blanking

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FIGURE 5. Deflection Vertical Blanking

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FIGURE 6. Logic Clamp Pulse

LM1238 Datasheet(PDF) 6 Page - National Semiconductor (TI)