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LM1208 Dataheets PDF



Part Number LM1208
Manufacturers National Semiconductor
Logo National Semiconductor
Description 130 MHz/85 MHz RGB Video Amplifier System with Blanking
Datasheet LM1208 DatasheetLM1208 Datasheet (PDF)

LM1208 130 MHz/85 MHz RGB Video Amplifier System with Blanking OBSOLETE October 2001 LM1208 130 MHz/85 MHz RGB Video Amplifier System with Blanking General Description The LM1208 is a very high frequency video amplifier system intended for use in high resolution RGB monitor applications. In addition to the three matched video amplifiers, the LM1208 contains three gated single ended input black level clamp comparators for brightness control, three matched DC controlled attenuators for contrast .

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LM1208 130 MHz/85 MHz RGB Video Amplifier System with Blanking OBSOLETE October 2001 LM1208 130 MHz/85 MHz RGB Video Amplifier System with Blanking General Description The LM1208 is a very high frequency video amplifier system intended for use in high resolution RGB monitor applications. In addition to the three matched video amplifiers, the LM1208 contains three gated single ended input black level clamp comparators for brightness control, three matched DC controlled attenuators for contrast control, and three DC controlled sub-contrast attenuators providing independent full range gain control in each channel for wide range white balance. All DC control inputs offer high input impedance and an operation range from 0V to 4V for easy interface to bus controlled alignment systems. The LM1208 also contains a blanking circuit which clamps the video output voltage during blanking to within 0.1V above ground. This feature provides blanking capability at the cathodes of the CRT. A spot killer is provided for CRT phosphor protection during power-down. n ESD susceptibility above 3 kV n Three externally gated single ended input comparators for cutoff and brightness control n 0V to 4V, high input impedance DC contrast control ( > 40 dB range) n 0V to 4V, high input impedance DC full range gain control (Drive) for each video channel ( > 40 dB range) n Spot killer, blanks output when VCC < 10.6V n Capable of 7 VPP output swing (slight reduction in bandwidth) n Output stage blanking n Output stage directly drives most hybrid or discrete CRT drivers Applications n n n n High resolution RGB CRT monitors Video AGC amplifiers Wideband amplifiers with gain and DC offset controls Interface amplifiers for LCD or CCD systems Features n Three wideband video amplifiers 130 MHz (LM1208) @ −3 dB (4 VPP output) n Matched ( ± 0.1 dB or 1.2%) attenuators for contrast control Block and Connection Diagram DS100083-1 FIGURE 1. Order Number LM1208 See NS Package Number N28B © 2001 National Semiconductor Corporation DS100083 www.national.com LM1208 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 (VCC) Pins 3, 11, 22, 23, 25 (Note 3) Peak Video Output Source Current (Any One Amp) Pins 17, 20 or 26 Voltage at Any Input Pin (VIN) Power Dissipation (PD) (Above 25˚C Derate Based on θJA and TJ) 15V 28 mA VCC ≥ VIN ≥ GND Thermal Resistance (θJA) Junction Temperature (TJ) ESD Susceptibility (Note 4) ESD Machine Model (Note 15) Storage Temperature Lead Temperature (Soldering, 10 sec.) 50˚C/W 150˚C 3 kV 350V −65˚C to 150˚C 265˚C Operating Ratings(Note 2) Temperature Range Supply Voltage (VCC) −20˚C to 80˚C 10.8V ≤ VCC ≤ 13.2V 2.5W DC Electrical Characteristics See DC Test Circuit (Figure 2), TA = 25˚C; VCC1 = VCC2 = 12V. V12 = 4V; V14 = 0V; Vcut-off = 1.0V; V13 = 4V; Vdrive = 4V unless otherwise stated. Symbol IS V4, 6, 9 RIN V14l V14h I14l I14h Iclamp Ibias V13l V13h I13l I13h VOL VOH VO(1V) ∆VO(1V) VOL(blanked) I12, 15, 18 or 28 I16, 19 and 27 Vspot Supply Current Video Amplifier Input Bias Voltage Video Input Resistance Clamp Gate Low Input Voltage Clamp Gate High Input Voltage Clamp Gate Low Input Current Clamp Gate High Input Current Clamp Cap Charge Current Clamp Cap Bias Discharge Current Blank Gate Low Input Voltage Blank Gate High Input Voltage Blank Gate Low Input Current Blank Gate High Input 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 (All Inputs) Spot Killer Voltage Any One Amplifier Clamp Comparators On Clamp Comparators Off V14 = 0V V14 = 12V Clamp Comparators On Clamp Comparators Off Blank Gate On Blank Gate Off V13 = 0V V13 = 12V Vcut-off = 0V Vcut-off = 9V Vcut-off = 1V Between Any Two Amplifiers, Vcut-off = 1V V13 = 0V Vcontrast = Vdrive = 0V to 4V Vcut-off = 0V to 4V VCC Adjusted to Activate 35 −250 −500 10.4 10.8 70 mV (max) nA nA V (max) Parameter Conditions VCC1 + VCC2, RL = ∞ (Note 7) Typical (Note 5) 90 2.8 20 1.2 1.6 −1 0.01 0.8 2.0 −5 1.0 Limit (Note 6) 105 mA (max) V kΩ V (max) V (min) µA (max) µA (max) µA (min) nA 0.8 2.0 −11.0 1.0 0.5 7 V (max) V (min) µA (max) µA (max) V (max) V (min) V (Note 8) mV (max) Units ± 750 500 1.2 1.6 −5.0 0.01 0.15 7.5 1.0 ± 500 ± 100 www.national.com 2 LM1208 AC Electrical Characteristics (Note 14) See AC Test Circuit (Figure 3 ) , TA = 25˚C; VCC1 = VCC2 = 12V. Manually adjust Video Output pins 17, 20, and 26 to 4V DC for the AC test unless otherwise stated. Symbol AV max ∆AV 2V ∆AV 0.25V ∆Drive2V ∆Drive0.25V AV match AV track1 THD f (−3 dB) tr(Video) tf(Video) Vsep 10 kHz Vsep 10 MHz tr(Blank) tf(Blank) tpw(Clamp) Parameter Video Amplifier Gain Attenuation @ 2V Attenuation @ 0.25V Drive Attenuation @ 2V Drive Attenuation @ 0.25V Ab.


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