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

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM1238
Description  110 MHz I2C Compatible RGB Preamplifier with Internal Simple OSD Generator and 4 DACs
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM1238 Datasheet(HTML) 6 Page - National Semiconductor (TI)

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Typical Performance Characteristics
V
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.
20038754
FIGURE 2. Logic Horizontal Blanking
20038755
FIGURE 3. Logic Vertical Blanking
20038756
FIGURE 4. Deflection Horizonal Blanking
20038757
FIGURE 5. Deflection Vertical Blanking
20038758
FIGURE 6. Logic Clamp Pulse
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