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LM1282 Dataheets PDF



Part Number LM1282
Manufacturers National Semiconductor
Logo National Semiconductor
Description 110MHz RGB Video Amplifier
Datasheet LM1282 DatasheetLM1282 Datasheet (PDF)

LM1282 110MHz RGB Video Amplifier System with On Screen Display (OSD) June 1998 LM1282 110 MHz RGB Video Amplifier System with On Screen Display (OSD) General Description The LM1282 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 1280 x 1024. The video section of the LM1282 features three matched video amplifiers with blanking. All of the video amplifier adjustments feature high input impedance 0V .

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LM1282 110MHz RGB Video Amplifier System with On Screen Display (OSD) June 1998 LM1282 110 MHz RGB Video Amplifier System with On Screen Display (OSD) General Description The LM1282 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 1280 x 1024. The video section of the LM1282 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 controlled 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 adjusting the drive controls for color balance of the video signal, the color balance of the OSD display will track these color adjustments. The LM1282 also features an internal spot killer circuit to protect the CRT when the monitor is turned off. For applications without OSD insertion please refer to the LM1205 or LM1208 data sheets. n n n n n n n n n TTL OSD inputs, 50 MHz bandwidth On chip blanking, outputs under 0.1 V when blanked High speed Video/OSD switch Independent drive control for each channel for color balance 0V to 4V, high impedance DC contrast control with over 40 dB range 0V to 4V, high impedance DC drive control (0 dB to −12 dB range) 0V to 4V, high impedance DC OSD contrast control with over 40 dB range Capable of 7 VPP output swing (slight reduction in bandwidth) Output stage directly drives most hybrid or discrete CRT drivers Applications n High resolution RGB CRT monitors requiring OSD capability Features n Three wideband video amplifiers 110 MHz @ −3 dB (4 VPP output) Block and Connection Diagram DS012519-1 FIGURE 1. Order Number LM1282N See NS Package Number N28B © 1998 National Semiconductor Corporation DS012519 www.national.com Absolute Maximum Ratings (Note 1) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Pins 6, 9, and 22 Peak Video Output Source Current (Any One Amp) Pins 18, 20, and 23 Voltage at Any Input Pin (VIN) Power Dissipation (PD) (Above 25˚C Derate based on θJA and TJ) Thermal Resistance to Ambient (θJA) 15V 28 mA VCC ≥ VIN ≥ GND Thermal Resistance to Case (θJC) Junction Temperature (TJ) ESD Susceptibility (Note 4) ESD Machine Model (Note 17) Storage Temperature Lead Temperature (Soldering, 10 sec.) 28˚C/W 150˚C 2 kV 200V −65˚C to 150˚C 265˚C Operating Ratings (Note 2) Temperature Range Supply Voltage (VCC) −20˚C to 70˚C 11.4V ≤ VCC ≤ 12.6V 2.5W 45˚C/W DC Electrical Characteristics See DC Test Circuit (Figure 2), TA = 25˚C; VCC1 = VCC2 = 12V; V13 = 4V; V14 = 4V; V16 = 4V; Vdrive = 4V; V4 = 0V; V15 = 0V; V25 = 1V unless otherwise stated Symbol IS RIN V15l V15h I15l I15h V16l V16h I16l I16h V12 Ivid-clamp Ivid-bias Iout-clamp Iout-bias VOL VOH VO(1V) ∆VO(1V) VOL (blanked) I13,14, 26, 27, or 28 I25 Vspot Parameter Supply Current Video Input Resistance Clamp Gate Low Input Voltage Clamp Gate High Input Voltage Clamp Gate Low Input Current Clamp Gate High Input Current Blank Gate Low Input Voltage Blank Gate High Input Voltage Blank Gate Low Input Current Blank Gate High Input Current Reference Voltage Video Input Cap Charge Current Video Input Cap Bias Discharge Current Output Clamp Cap Charge Current Output Clamp Cap Bias Discharge Current Video Output Low Voltage Video Output High Voltage Video Black Level Output Voltage Video ∆Black Level Output Voltage Video Output Blanked Voltage Contrast/Drive Control Input Current Cut-Off Control Input Current Spot Killer Voltage V25 = 0V V25 = 10V V25 = 1V Between Any Two Amplifiers, V25 = 1V Blank Gate On (V16 ≤ 0.8V) Vcontrast = Vdrive = 0V to 4V V25 = 0V to 4V VCC Adjusted to Activate 50 8.0 1.1 100 7.5 mV (max) V (min) V (Note 8) mV (max) mV (max) nA (max) µA (max) V Clamp Comparators On Clamp Comparators Off Clamp Comparators On Clamp Comparators Off Conditions VCC1 + VCC2, RL = ∞ (Note 7) Any One Amplifier Clamp Comparators On Clamp Comparators Off V15 = 0V V15 = 12V Blank Gate On Blank Gate Off V16 = 0V V16 = 12V Typical (Note 5) 95 100 1.2 1.6 −2.5 0.01 1.2 1.6 −1.5 0.01 2.0 1.0 1.0 0.8 2.0 0.8 2.0 Limit (Note 6) 120 mA (max) kΩ V (max) V (min) µA (max) µA (max) V (max) V (min) µA (max) µA (max) V µA (min) nA Units ± 900 ± 450 ± 850 450 ± 450 ± 450 µA (min) nA ± 20 100 −125 −0.25 10.6 ± 250 500 −500 −1.5 11.2 www.national.com 2 AC Electrical Characteristics (Note 15) See AC Test Circuit (Figure 3) , TA = 25˚C, VCC1 = VCC2 = 12V; V4 = 0V. Manually adjust Video Output pins 18, 20, and 23 to 4V DC for the AC test unless otherwise stated Symbol AV max ∆AV 2V ∆AV 0.25V ∆Drive2V ∆Drive0.25V AV match AV track THD f(−3.


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