LM1279 National Semiconductor, LM1279 Datasheet
LM1279
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LM1279 Summary of contents
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... LM1279 110 MHz RGB Video Amplifier System with OSD General Description The LM1279 is a full featured and low cost video amplifier with OSD (On Screen Display). 8V operation for low power and increased reliability. Supplied in a 20-pin DIP package, accommodating very compact designs of the video channel requiring OSD ...
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... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Pins 2 and 16 (Note 3) Peak Video Output Source Current (Any One Amp) Pins 13, 15 Voltage at Any Input Pin ( ...
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AC Electical Characteristics T = 25˚ 8V. Manually adjust Video Output pins 13, 15, and for the AC test unless otherwise A CC1 CC2 stated. (Note 15) Symbol Parameter A Contrast Attenuation ...
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Timing Diagrams www.national.com DS100091-2 FIGURE 2. OSD Rise and Fall Times DS100091-3 FIGURE 3. OSD Propagation Delays FIGURE 4. Sandcastle Sync Pulse 4 DS100091-4 ...
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... EOS (Electrical Over Stress). If the OSD signals are external to the monitor, or these signals are present any time when +8V is not fully powered up, then the OSD inputs also require a series 30 FIGURE 5. LM1279 OSD Video Pre-amp Demonstration Board Schematic resistor. ...
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Pin Descriptions Pin Pin No. Name 1 Red OSD Input 19 Blue OSD Input 20 Green OSD Input 2 V CC1 3 Red Video In 5 Green Video In 8 Blue Video In 4 Red Clamp Cap 7 Green Clamp ...
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... V CC2 ESD and Arc-Over Protection The ESD cells of the LM1279 are improved over the ESD cells used in typical video pre-amps. The monitor designer must still use good PC board layout techniques when de- signing with the LM1279. The human body model ESD sus- ceptibility of these parts is rated (Note 4) ...
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... A2. The other input to gm1 is the desired black level output of the LM1279. Since the LM1279 has a fixed black level out- put, the non-inverting inputs to gm1 in all three channels fixed 1.35V internal reference. This sets the black level output to a nominal 1 ...
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... This does reduce the head- room of the video output. Board layout is always critical in a high frequency application such as using the LM1279. A poor layout can result in ringing resistors will of the video waveform after sudden transitions, or the part could actually oscillate ...
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... Applications of the LM1279 FIGURE 7. LM1279 OSD Video Pre-Åmp Demontration Board Layout FIGURE 8. LM1279 Rise Time www.national.com DS100091-16 FIGURE 9. LM1279 Fall Time 10 DS100091-13 DS100091-17 ...
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... Applications of the LM1279 (Continued) 11 www.national.com ...
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... Applications of the LM1279 FIGURE 11. LM1279/LM2407 Demonstration Neck Board Layout www.national.com (Continued) 12 DS100091-15 ...
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... Italiano National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. Order Number LM1279N NS Package Number N20A 2. A critical component in any component of a life support ...