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LM1281 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM1281
Description  85 MHz RGB Video Amplifier System with On Screen Display (OSD)
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com

LM1281 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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85 MHz RGB Video Amplifier System with On Screen
Display (OSD)
General Description
The LM1281 is a full feature video amplifier with OSD inputs,
all within a 28-pin package. This part is intended for use in
monitors with resolutions up to 1024 x 768. The video sec-
tion of the LM1281 features three matched video amplifiers
with blanking. All of the video amplifier adjustments feature
high input impedance 0V to 4V DC controls, providing easy
interfacing to bus controlled alignment systems. The OSD
section features three TTL inputs and a DC contrast control.
The switching between the OSD and video section is con-
trolled by a single TTL input. Although the OSD signals are
TTL inputs, these signals are internally processed to match
the OSD logic low level to the video black level. When ad-
justing the drive controls for color balance of the video sig-
nal, the color balance of the OSD display will track these
color adjustments. The LM1281 also features an internal
spot killer circuit to protect the CRT when the monitor is
turned off. For applications without OSD insertion please re-
fer to the LM1205 or LM1208 data sheets.
n Three wideband video amplifiers 85 MHz @ −3 dB
(4 V
PP output)
n TTL OSD inputs, 50 MHz bandwidth
n On chip blanking, outputs under 0.1 V when blanked
n High speed Video/OSD switch
n Independent drive control for each channel for color
n 0V to 4V, high impedance DC contrast control with over
40 dB range
n 0V to 4V, high impedance DC drive control (0 dB to
−12 dB range)
n 0V to 4V, high impedance DC OSD contrast control with
over 40 dB range
n Capable of 7 VPP output swing (slight reduction in
n Output stage directly drives most hybrid or discrete CRT
n High resolution RGB CRT monitors requiring OSD
Block and Connection Diagram
FIGURE 1. Order Number LM1281N
See NS Package Number N28B
April 1999
© 1999 National Semiconductor Corporation

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