LM1208N

LM1208 NSC | Alldatasheet

Document overview

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Technical content

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 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 High resolution RGB CRT monitors n Video AGC amplifiers n Wideband amplifiers with gain and DC offset controls n Interface amplifiers for LCD or CCD systems Block and Connection Diagram DS100083-1 FIGURE 1. Order Number LM1208 See NS Package Number N28B OBSOLETE October 2001 LM1208 130 MHz/85 MHz RGB Video Amplifier System with Blanking © 2001 National Semiconductor Corporation DS100083 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 (V CC ) Pins 3, 11, 22, 23, 25 (Note 3) 15V Peak Video Output Source Current (Any One Amp) Pins 17, 20 or 26 28 mA Voltage at Any Input Pin (VIN)V CC ≥ VIN ≥ GND Power Dissipation (PD ) (Above 25˚C Derate Based onθJA and TJ) 2.5W Thermal Resistance (θJA) 50˚C/W Junction Temperature (TJ) 150˚C ESD Susceptibility (Note 4) 3 kV ESD Machine Model (Note 15) 350V Storage Temperature −65˚C to 150˚C Lead Temperature (Soldering, 10 sec.) 265˚C Operating Ratings(Note 2) Temperature Range −20˚C to 80˚C Supply Voltage (VCC ) 10.8V ≤ VCC ≤ 13.2V See DC Test Circuit(Figure 2),TA = 25˚C; VCC1 =V CC2 = 12V. V12 = 4V; V14 = 0V; Vcut-off= 1.0V; V13 = 4V; Vdrive= 4V un- less otherwise stated. Symbol Parameter Conditions Typical Limit Units (Note 5) (Note 6) IS Supply Current V CC1 +V CC2 ,R L = ∞ (Note 7) 90 105 mA (max) V4, 6, 9 Video Amplifier Input Bias Voltage 2.8 V R IN Video Input Resistance Any One Amplifier 20 k Ω V14l Clamp Gate Low Input Voltage Clamp Comparators On 1.2 0.8 V (max) V14h Clamp Gate High Input Voltage Clamp Comparators Off 1.6 2.0 V (min) I14l Clamp Gate Low Input Current V 14 = 0V −1 −5 µA (max) I14h Clamp Gate High Input Current V 14 = 12V 0.01 1.0 µA (max) Iclamp Clamp Cap Charge Current Clamp Comparators On ±750 ±500 µA (min) Ibias Clamp Cap Bias Discharge Current Clamp Comparators Off 500 nA V13l Blank Gate Low Input Voltage Blank Gate On 1.2 0.8 V (max) V13h Blank Gate High Input Voltage Blank Gate Off 1.6 2.0 V (min) I13l Blank Gate Low Input Current V 13 = 0V −5.0 −11.0 µA (max) I13h Blank Gate High Input Current V 13 = 12V 0.01 1.0 µA (max) VOL Video Output Low Voltage V cut-off= 0V 0.15 0.5 V (max) VOH Video Output High Voltage V cut-off= 9V 7.5 7 V (min) VO(1V) Video Black Level Output Voltage V cut-off= 1V 1.0 V (Note 8) ΔVO(1V) VideoΔ Black Level Output Voltage Between Any Two Amplifiers, ±100 mV (max) Vcut-off=1 V VOL (blanked) Video Output Blanked Voltage V 13 = 0V 35 70 mV (max) I12, 15, 18 or 28 Contrast/Drive Control Input Current Vcontrast=V drive= 0V to 4V −250 nA I16, 19 and 27 Cut-Off Control Input Current (All Inputs) Vcut-off= 0V to 4V −500 nA Vspot Spot Killer Voltage V CC Adjusted to Activate 10.4 10.8 V (max) LM1208 www.national.com 2

See AC Test Circuit (Figure 3),T A = 25˚C; VCC1 =V CC2 = 12V. Manually adjust Video Output pins 17, 20, and 26 to 4V DC for the AC test unless otherwise stated. Symbol Parameter Conditions Typical Limit Units (Note 5) (Note 6) AV max Video Amplifier Gain V12 = 4V, V IN = 635 mVPP 7.0 6.0 V/V (min) Vdrive= 4V 16.9 15.6 dB (min) ΔAV2 V Attenuation@ 2V Ref: A V max, V12 = 2V −6 dB ΔAV 0.25V Attenuation@ 0.25V Ref: A V max, V12 = 0.25V −40 dB ΔDrive2V Drive Attenuation@ 2V Ref: A V max, Vdrive=2 V − 6 d B ΔDrive0.25V Drive Attenuation@ 0.25V Ref: A V max, Vdrive= 0.25V −40 dB AV match Absolute Gain Match@ AV max V12 = 4V, V drive= 4V (Note 9) ±0.3 dB AV track1 Gain Change Between Amplifiers V12 = 4V to 2V (Note 9) (Note 10) ±0.1 dB THD Video Amplifier Distortion V O =1V PP ,f=1 0k H z 1 % f (−3 dB) Video Amplifier Bandwidth V12 = 4V, V drive= 4V, MHz(Note 11) (Note 12) V O =4V PP tr(Video) Video Output Rise Time (Note 11) V O =4V PP 2.8 ns tf(Video) Video Output Fall Time (Note 11) V O =4V PP 3.4 ns Vsep 10 kHz Video Amplifier 10 kHz Isolation V12 = 4V (Note 13) −70 dB Vsep 10 MHz Video Amplifier 10 MHz Isolation V12 = 4V (Note 11) (Note 13) −50 dB tr(Blank) Blank Output Rise Time (Note 11) Blank Output = 1 VPP 7n s tf(Blank) Blank Output Fall Time (Note 11) Blank Output = 1 VPP 7n s tpw (Clamp) Min. Back Porch Clamp Pulse Width 200 ns Note 1:Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Note 2:Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Note 3:VCC supply pins 3, 11, 22, 23, 25 must be externally wired together to prevent internal damage during VCC power on/off cycles. Note 4:Human body model, 100 pF discharged through a 1.5 kΩ resistor. Note 5:Typical specifications are specified at +25˚C and represent the most likely parametric norm. Note 6:Tested limits are guaranteed to National’s AOQL (Average Outgoing Quality Level). Note 7:The supply current specified is the quiescent current for VCC1 and VCC2 with RL = ∞ , seeFigure 2’s test circuit. The supply current for VCC2 (pin 23) also depends on the output load. With video output at 1V DC, the additional current through VCC2 is 8 mA forFigure 2’s test circuit. Note 8:Output voltage is dependent on load resistor. Test circuit uses RL = 390Ω . Note 9:Measure gain difference between any two amplifiers. VIN = 635 mVPP . Note 10:ΔAV track is a measure of the ability of any two amplifiers to track each other and quantifies the matching of the three attenuators. It is the difference in gain change between any two amplifiers with the contrast voltage (V12) at either 4V or 2V measured relative to an AV max condition, V12 = 4V. For example, at AV measured typical ± 0.1 dB channel tracking. Note 11:When measuring video amplifier bandwidth or pulse rise and fall times, a double sided full ground plane printed circuit board without socket is recommended. Video amplifier 10 MHz isolation test also requires this printed circuit board. The reason for a double sided full ground plane PCB is that large measurement variations occur in single sided PCBs. Note 12:Adjust input frequency from 10 MHz (AV max reference level) to the −3 dB corner frequency (f−3 dB). Note 13:Measure output levels of the other two undriven amplifiers relative to the driven amplifier to determine channel separation. Terminate the undrivenamplifier inputs to simulate generator loading. Repeat test at fIN = 10 MHz for Vsep 10 MHz. Note 14:During the AC tests the 4V DC level is the center voltage of the AC output signal. For example, if the output is 4 VPP the signal will swing between 2V DC and 6V DC. Note 15:Machine Model ESD test is covered by specification EIAJ IC-121-1981. A 200 pF cap is charged to the specified voltage, then discharged directly into the IC with no external series resistor (resistance of discharge path must be under 50Ω ). LM1208 www.national.com3

Typical Performance CharacteristicsVCC = 12V, TA = 25˚C unless otherwise specified Attenuation vs Contrast Voltage DS100083-2 Attenuation vs Drive Voltage DS100083-3 LM1208 www.national.com 4

Typical Performance CharacteristicsVCC = 12V, TA = 25˚C unless otherwise specified (Continued) LM1208 Crosstalk vs Frequency DS100083-4 LM1208 Contrast vs Frequency DS100083-5 LM1208 Drive vs Frequency DS100083-6 LM1208 www.national.com5

FIGURE 2. LM1208 DC Test Circuit

FIGURE 3. LM1208 AC Test Circuit

FIGURE 4. LM1208 PCB Test Circuit

FIGURE 19. LM1208 Typical Application

Physical Dimensionsinches (millimeters) unless otherwise noted LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Corporation Americas Email: support@nsc.com National Semiconductor Europe Fax: +49 (0) 180-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 69 9508 6208 English Tel: +44 (0) 870 24 0 2171 Français Tel: +33 (0) 1 41 91 8790 National Semiconductor Asia Pacific Customer Response Group Tel: 65-2544466 Fax: 65-2504466 Email: ap.support@nsc.com National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 www.national.com Order Number LM1208N LM1208 130 MHz/85 MHz RGB Video Amplifier System with Blanking 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.