LM1205A TI1 | Alldatasheet
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LM1205A, LM1207A
130 MHz/85 MHz RGB Video Amplifier System with Blanking
Literature Number: SNAS565
130 MHz/85 MHz RGB Video Amplifier System with
The LM1205A/LM1207A is a very high frequency video am- plifier system intended for use in high resolution RGB moni- tor applications. In addition to the three matched video am- plifiers, the LM1205A/LM1207A 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 gain trim capability for white balance. All DC con- trol inputs offer high input impedance and an operation range from 0V to 4V for easy interface to bus controlled alignment systems. The LM1205A/LM1207A 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.
Features
n Three wideband video amplifiers 130 MHz (LM1205A)@ −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 drive control for each video amplifier (−6 dB to 0 dB range) n Spot killer, blanks output when V CC < 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 DS012866-1 FIGURE 1. Order Number LM1205AN or LM1207AN, See NS Package Number N28B August 1996 LM1205A/LM1207A 130 MHz/85 MHz RGB Video Amplifier System with Blanking © 1997 National Semiconductor Corporation DS012866 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 (V CC ) 10.8V ≤ VCC ≤ 13.2V See DC Test Circuit(Figure 2), TA = 25˚C; VCC1 = VCC2 = 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 VCC1 +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 kΩ 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 V14 = 0V −1 −5 µA (max) I14h Clamp Gate High Input Current V14 = 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 V13 = 0V −8.5 −11.0 µA (max) I13h Blank Gate High Input Current V13 = 12V 0.01 1.0 µA (max) VOL Video Output Low Voltage Vcut-off= 0V 0.15 0.5 V (max) VOH Video Output High Voltage Vcut-off= 9V 7.5 7 V (min) VO(1V) Video Black Level Output Voltage V cut-off= 1V 1.0 V (Note 8) ΔV O(1V) VideoΔ Black Level Output Voltage Between Any Two Amplifiers, ±100 mV (max) Vcut-off= 1V VOL (blanked) Video Output Blanked Voltage V13 = 0V 35 70 mV (max) I12, 15, 18 or 28 Contrast/Drive Control Input Current Vcontrast= Vdrive= 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 VCC Adjusted to Activate 10.4 10.8 V (max) www.national.com 2
See AC Test Circuit (Figure 3),T A = 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 Parameter Conditions Typical Limit Units (Note 5) (Note 6) AV max Video Amplifier Gain V12 = 4V, VIN = 635 mV PP 7.0 6.0 V/V (min) Vdrive= 4V 16.9 15.6 dB (min) ΔA V2 V Attenuation@ 2V Ref: AV max, V12 = 2V −6 dB ΔA V 0.25V Attenuation@ 0.25V Ref: AV max, V12 = 0.25V −40 dB ΔDrive Drive Control Range Vdrive= 0V to 4V, V12= 4V 6 dB AV match Absolute Gain Match@ AV max V12 = 4V, Vdrive= 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 = 10 kHz 1 % f (−3 dB) Video Amplifier Bandwidth V12 = 4V, Vdrive= 4V, LM1205A 130 MHz (Note 11) (Note 12) V O = 4V PP LM1207A 85 tr(Video) Video Output Rise Time (Note 11) V O = 4V PP LM1205A 2.6 ns LM1207A 4.3 tf(Video) Video Output Fall Time (Note 11) V O = 4V PP LM1205A 3.6 ns LM1207A 4.3 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 = 1V PP 7n s tf(Blank) Blank Output Fall Time (Note 11) Blank Output = 1V PP 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 de- grade 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 mV PP . Note 10:ΔA V 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 sured 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 recom- mended. 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 undriven amplifier 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). 3 www.national.com
Typical Performance CharacteristicsVCC = 12V, TA = 25˚C unless otherwise specified Attenuation vs Contrast Voltage DS012866-2 Attenuation vs Drive Voltage DS012866-3 www.national.com 4
Typical Performance CharacteristicsVCC = 12V, TA = 25˚C unless otherwise specified (Continued) LM1205A Crosstalk vs Frequency DS012866-4 LM1205A Contrast vs Frequency DS012866-5 LM1205A Drive vs Frequency DS012866-6 5 www.national.com
Typical Performance CharacteristicsVCC = 12V, TA = 25˚C unless otherwise specified (Continued) LM1207A Crosstalk vs Frequency DS012866-7 LM1207A Contrast vs Frequency DS012866-8 LM1207A Drive vs Frequency DS012866-9 www.national.com 6
FIGURE 2. LM1205AN/LM1207AN DC Test Circuit
FIGURE 3. LM1205AN/LM1207AN AC Test Circuit
FIGURE 4. LM1205AN/LM1207AN PCB Test Circuit
FIGURE 16. Demonstration Board Layout
Physical Dimensionsinches (millimeters) unless otherwise noted LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DE- VICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL SEMI- CONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or sys- tems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose fail- ure 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 in any component of a life support device or system whose failure to perform can be rea- sonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: +49 (0) 1 80-530 85 86 Email: europe.support@nsc.com Deutsch Tel: +49 (0) 1 80-530 85 85 English Tel: +49 (0) 1 80-532 78 32 Français Tel: +49 (0) 1 80-532 93 58 Italiano Tel: +49 (0) 1 80-534 16 80 National Semiconductor Hong Kong Ltd. 13th Floor, Straight Block, Ocean Centre, 5 Canton Rd. Tsimshatsui, Kowloon Hong Kong Tel: (852) 2737-1600 Fax: (852) 2736-9960 National Semiconductor Japan Ltd. Tel: 81-3-5620-6175 Fax: 81-3-5620-6179 Order Number LM1205AN or LM1207AN LM1205A/LM1207A 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.
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