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| ISO-9001 CERTIFIED BY DSCC M.S.KENNEDY CORP. FEATURES: ULTRA HIGH SPEED/VOLTAGE VIDEO AMPLIFIER 1932 SERIES (315) 701-6751 4707 Dey Road Liverpool, N.Y. 13088 Low Cost Complete Amplifier System 100Vpp Output Signal Into 10pF Ultra Fast Transition Times: 1.7nS @ 50Vpp User Adjustable Contrast and Brightness TTL Compatible Blanking On Board DC Reference Output Customized Versions Readily Available Available with Three Lead Bend Options MIL-PRF-38534 CERTIFIED DESCRIPTION: The MSK 1932 Series of High Speed, High Voltage Video Amplifiers is designed to directly drive the cathode of today's high performance CRT's. The MSK 1932 has user adjustable contrast and brightness levels and also comes with a blanking function. The MSK 1932 can be directly connected to many video sources including RS170, RS343 and high speed video D/A converters. The MSK 1932 is available in four versions for different applications. The MSK 1932-0 has no internal high voltage resistor or inductor allowing the user to dissipate much of the power externally. The MSK 1932-2, MSK 1932-4 and the MSK 1932-6 each have an internal resistor-inductor designed for optimum bandwidth. The MSK 1932-6 has slightly lower bandwidth but can be operated from up to +130V. Each version of the MSK 1932 is packaged in an isolated 22 pin insulated ceramic substrate that can be directly connected to a heat sink using standard mounting techniques. The leads are available straight out, bent up or bent down. EQUIVALENT SCHEMATIC TYPICAL APPLICATIONS Helmet Mounted Displays High Resolution RGB Displays High Resolution Monochrome Displays Automatic Test Equipment Medical Monitors CAE/CAD Station Monitors 1 2 3 4 5 6 7 8 PIN-OUT INFORMATION Ground Ground Blank VEE -Input +Input Ground VGain 1 9 10 11 12 13 14 15 16 Voff Vref Ground +VHV RES +VHV RES Ground +VHV +VHV 17 18 19 20 21 22 Output Cath Rtn Vcc Vcc Ground Ground Rev. B 8/00 ABSOLUTE MAXIMUM RATINGS +VHV ELECTRICAL SPECIFICATIONS Parameter STATIC Quiescent Current High Voltage Supply INPUT Input Bias Current Blank Input Current 6 6 7 VCM=0V VBLANK=0.4V VBLANK=2.4V VOFF=1V VGAIN=5V Normal Operation Either Input F=DC Either Input VBLANK=2.4V VIN=0.3V 4 4 V=VHV-VOUT VGAIN=5V 30 10K 25 6 IOUT<2mA V=VHV-VOUT VOFF=1V VBLANK=2.4V VGAIN=5V V=VHV-VOUT VOFF=0V VGAIN=3V V=VHV-VOUT VOFF=5V VIN=0.6V F=10KHz VGAIN=3V Both Inputs 6 6 VGAIN=3V F=10KHz VGAIN=3V F=10KHz VIN=0.6V TR=TF<0.5nS VGAIN =4V VOFF=1V VCM=0.5V VOFF=1V VIN=2.0V VCM=0.5V 3 5.2 -3xRp 0 32 72 95 1 500 300 2 2 40 20K 2 30 0 5.5 Rp 3 42 110 98 10 3.5 50 600 400 10 10 2xRp 10xRp 5.8 30 10K 25 380 5.2 1 500 300 2 2 40 20K 2 30 400 5.5 Rp 3 42 110 98 10 2.8 50 600 400 10 10 2xRp 10xRp 420 5.8 30 10K 25 190 5.2 1 500 300 2 2 40 20K 2 30 200 5.5 Rp 3 21 55 68 10 1.7 50 600 400 10 10 2xRp 10xRp 210 5.8 30 10K 25 380 5.2 1 500 300 2 2 40 20K 2 30 400 5.5 Rp 3 42 120 118 10 6 50 600 400 10 10 A A A A A nS dB pF 6 2 3 QOUT and QCAS VCM=0V @ +15V VCM=0V @ -10.5V 30 75 -75 100 10 100 -100 110 13 30 75 -75 100 10 100 -100 110 13 30 75 -75 70 10 100 -100 75 13 30 75 -75 120 8 100 -100 130 12 mA mA V C/W Test Conditions 1 MSK1932-0 Min. MSK1932-2 MSK1932-4 MSK1932-6 Units Typ. Max. Min. Typ. Max. Min. Typ. Max. Min. Typ. Max. Thermal Resistance to Case 3 Offset Adjust Input Current Gain Adjust Input Current 7 Blank Input Pulse Width Input Impedance 3 Input Capacitance 3 Blank Mode Input Rejection V 3 Gain Adjust Rejection V 3 Internal Rp OUTPUT Reference Output Voltage V Blank Mode 4 5 6 V Min Offset 5 V Max Offset 5 Voltage Gain 6 Output Voltage High Output Voltage Low Transistion Times 7 Linearity Error 3 Gain Linearity 3 Thermal Distortion 6 6 3 4 3 Common Mode Rejection Ratio 3 VCM=0.5V F=10Hz 2xRp mV 10xRp mV 420 5.8 3xRp 10 52 145 20 8 2 2 2 dB V mV V V V/V V V nS %GS % %GS Power Supply Rejection Ratio 3 +VCC and -VEE=Nom 5% 3xRp -3xRp 6 52 138 20 4.5 2 2 2 0 32 72 95 - 3xRp -3xRp 6 52 138 20 4.0 2 2 2 0 16 36 65 - 3xRp -3xRp 6 26 68 20 2.5 2 2 2 0 32 72 115 - NOTES: 1 2 3 4 5 6 7 +VCC = +15V, -VEE = -10.5V, VBLANK = VGAIN = VOFF = VIN = 0V, CL=10pF, TC=25C unless otherwise specified. VHV=Typical Value for each dash number for all parameters. This parameter is quaranteed by design but need not be tested. Typical parameters are representative of actual device performance but are for reference only. RP=Internal RP except MSK 1932-0. External value = 400 unless otherwise specified for the MSK 1932-0. V is defined as the difference between +VHV and the output. Parameter is 100% tested on production devices. Parameter is sample tested in accordance with MSK industrial grade quality devices. 2 Rev. B 8/00 VCC VEE VIN VIC VGAIN VOFF TJ IRP TC High Voltage Supply (1932-0) (1932-2) (1932-4) (1932-6) Positive Supply Voltage Negative Supply Voltage Differential Input Voltage Common Mode Input Voltage Gain Adjust Input Voltage Offset Adjust Input Voltage +110V +110V +75V +130V +17V -12V 2V 2V -0.6 to +6V -0.6 to +6V VBLANK IREF TST TLD -0.6 to +6V Blank Input Voltage 5mA Reference Output Current Storage Temperature Range -40C to +150C 300C Lead Temperature Range (10 Seconds) 150C Junction Temperature 290mA Current Through Rp Case Operating Temperature -25C to +125C (All Devices) APPLICATION NOTES POWER SUPPLIES The input stage of the MSK 1932 requires power supplies of +15V and -10.5V for optimum operation. The negative power supply can be increased to -12V if -10.5V is not available, but additional power dissipation will cause the internal temperature to rise. Both low voltage power supplies should be effectively decoupled with tantalum capacitors (at least 4.7F) connected as close to the amplifier's pins as possible. The MSK 1932 has internal 0.01F capacitors that also improve high frequency performance. In any case, it is also recommended to put 0.1F decoupling capacitors on the +15V and -10.5V supplies as well. The high voltage power supply (+VHV) is connected to the amplifier's output stage and must be kept as stable as possible. The internal or external Rp is connected to +VHV and as such, the amplifier's DC output is directly related to the high voltage value. The +VHV pins of the hybrid should be decoupled to ground with as large a capacitor as possible to improve output stability. VIDEO INPUTS The video input signals should be kept below 2VMAX total, including both common mode offset and signal levels. The input structure of the MSK 1932 was designed for 0.714Vpp RS343 signals. If either input is not used it should be connected directly to the analog ground or through a 25 resistor to ground if input offset currents are to be minimized. OUTPUT PROTECTION The output pin of the MSK 1932 should be protected from transients by connecting reversed biased ultra-low capacitance diodes from the output pin to both +VHV and ground. The output can also be protected from arc voltages by inserting a small value (25-50) resistor in series with the amplifier. This resistor will reduce system bandwidth along with the load capacitance, but a series inductor can reduce the problem substantially. VGAIN CONTROL INPUT The VGAIN control (contrast) input is designed to allow the user to vary the video gain. By simply applying a DC voltage from 0V to VREF, the video gain can be linearly adjusted from 0 to 195V/V (MSK 1932-2). The VGAIN input should be connected to the VREF pin through a 5K pot to ground. For convenient stable gain adjustment, a 0.1F bypass capacitor should be connected near the VGAIN input pin to prevent output instability due to noisy sources. Digital gain control can be accomplished by connecting a D/A converter to the VGAIN pin. However, some temperature tracking performance may be lost when using an external DC voltage source other than VREF for gain adjustment. The bandwidth of the VGAIN input is approximately 1MHz. The overall video output of the MSK 1932 can be characterized using the following expression: SUPPLY SEQUENCING The power supply sequence is VHV, VCC, VEE followed by the other DC control inputs. If power supply sequencing is not possible, the time difference between each supply should be less than five milliseconds. If the DC control signals are being generated from a low impedance source other than the VREF output, reverse biased diodes should be connected from each input (VGAIN, VOFF) to the VCC pin. This will protect the inputs until VCC is turned on. VIDEO OUTPUT When power is first applied and VIN=VGAIN=VOFF=0V, the output will be practically at the +VHV rail voltage. The output voltage is a function of the value of Rp and also the VGAIN and VOFF DC inputs. The maximum output voltage swing for any of the MSK 1932 variants is determined by Vpp = (250mA) x (Rp). The bandwidth of the amplifier largely depends on both Rp and Lp. Hybrid pins 12 and 13 are directly connected to Rp. Additional external resistance can be added to reduce power dissipation, but slower transition times will result. If an additional resistor is used, it must be low capacitive and the layout should minimize capacitive coupling to ground (ie: no ground plane under Rp). The MSK 1932 Series is conservatively specified with low values for Lp which yield about 5% overshoot. Additional peaking can be obtained by using a high self-resonant frequency inductor in series with pins 12 & 13. Since this value of inductance can be very dependent on circuit layout, it is best to determine its value by experimentation. A good starting point is typically 0.47H for the MSK 1932-0 and 0.0047H for the remaining devices. Vpp=VHV-VOUT VHV-VOUT=(VIN)(VGAIN)(Rp)(0.09) (or) Voltage Gain=VOUT/VIN=(VGAIN)(Rp)(0.09) Here is a sample calculation for the MSK 1932-2: Given information VIN=0.7V VGAIN=1VDC Rp=400 (internal) VHV=100VDC VHV-VOUT=(0.7V)(1V)(400)(0.09) VHV-VOUT=25.2V Nominal The expected video output would swing from approximately +100V to +74.8V assuming that VOFF=0V. This calculation should be used as a nominal result because the overall gain may vary as much as 20% due to internal high speed device variations. Changing ambient conditions can also effect the video gain of the amplifier by as much as 150 PPM/C. It is wise to connect all video amplifiers to a common heat sink to maximize thermal tracking when multiple amplifiers are used in applications such as RGB systems. Additionally, only one of the VREF outputs should be shared by all three amplifiers. This voltage If external resistors or inductors are not used, be sure to should be buffered with a suitable low drift op-amp for best connect high frequency bypass capacitors directly from pins tracking performance. 12 and 13 to ground for the devices that contain an internal Rp. 3 Rev. B 8/00 APPLICATION NOTES CON'T VOFF CONTROL INPUT The brightness (output offset) can be linearly adjusted by applying a 0 to VREF DC voltage to the VOFF input pin. The output quiescent voltage range is from approximately (5A)(Rp) to (100mA)(Rp) from +VHV. This control voltage is normally generated by connecting the VOFF control pin to a 5K potentiometer between VREF and ground. The VOFF input pin should be bypassed with a 0.1F capacitor to ground placed as close as possible to the hybrid. This DC voltage can be any stable system source. The bandwidth of the VOFF pin is approximately 1MHz. Keep hybrid power dissipation in mind when adjusting the output quiescent voltage. Practically all of the voltage is seen across Rp! This power must be taken into account when high Rp currents are used. If the quiescent level is set too close to +VHV, the power dissipation will be minimal but the rise time will suffer slightly. If the quiescent level is set too far from +VHV, the power dissipation will increase dramatically and the output fall time will be limited. The output black level is obviously dependent on system requirements but a little experimentation will strike the optimum balance between power dissipation and bandwidth. Total current through Rp should be limited to less than 290mA when operating from power supplies greater than 90V. The gain adjust alone can set the AC current to 250mA (ie: 250mApp=100Vpp/400). Typically, most applications use about 10V from +VHV for a black level. BLANK INPUT The video input can be electrically disconnected from the ampliifer by applying a TTL high input to the blank pin. When this occurs, the output will be set to approximately +VHV. The VGAIN and VOFF control pins have little or no effect on the output when it is in blank mode. When the TTL compatible blank input is not used, the pin must be connected to ground to enable the amplifier. The blank input will float high when left unconnected which will disable the video. VREF OUTPUT The MSK 1932 has an on board buffered DC zener reference output. The VREF output is nominally 5.5V DC and has full temperature test limits of 5.2V to 5.8V DC. This output is provided for gain and offset adjustment and can source up to 4mA of current. THERMAL MANAGEMENT The MSK 1932 package has mounting holes that allow the user to connect the amplifier to a heat sink or chassis. Since the package is electrically isolated from the internal circuitry, mounting insulators are not required or desired for best thermal performance. Use 4 to 6 inch/pounds for mounting the device to the heat sink. The power dissipation of the amplifier depends mainly on the load requirements, bandwidth, pixel size, black level and the value of Rp. The following table illustrates a few examples: PERCENT OF SIGNAL BLANK 100% 20% 100% 20% BLACK 0% 40% 0% 40% WHITE 0% 40% 0% 40% OUTPUT AVE. Pd 0W 13.3W 0W 8.4W TOTAL AVE. Pd 2.5W 15.7W 2.5W 10.6W DEVICE TYPE 1932-6 1932-6 1932-4 1932-4 +VHV 120V 120V 70V 70V BLACK LEVEL 110V 110V 65V 65V WHITE LEVEL 20V 20V 15V 15V OUTPUT VOLTAGE 0V 90V 0V 50V This table does not include power dissipation due to output switching since this is dependent on individual load requirements. The input stage power dissipation is typically 2.5 watts and is essentially independent of output levels. RESOLUTION TABLE FOR TYPICAL CRT'S Display Resolution Maximun Pixel Time 182nS 52nS 38nS 26nS 12.6nS 11nS 8.9nS 5.8nS 2.8nS 860pS Minimum Pixel Clock Frequency 5MHz 19MHz 26MHz 38MHz 80MHz 90MHz 112MHz 170MHz 360MHz 1.2GHz Required Rise Time at CRT Cathode 60nS 17nS 12.5nS 8.6nS 4.2nS 3.7nS 2.9nS 1.9nS 1nS 280pS Required System Bandwidth (F-3dB) 6MHz 20MHz 28MHz 41MHz 84MHz 95MHz 120MHz 180MHz 380MHz 1.23GHz 320 x 200 640 x 350 640 x 480 800 x 560 1024 x 900 1024 x 1024 1280 x 1024 1664 x 1200 2048 x 2048 4096 x 3300 All data assumes retrace time equal to 30% of frame time and a 60Hz refresh rate. 4 Rev. B 8/00 TYPICAL CONNECTION CIRCUIT The connection circuit shown above is for the MSK 1932-0 evaluation board. The Rp and Lp are external components and must not be located near ground planes if possible. A high quality resistor such as Bradford Electronics P/ N FP10-400 is required for optimum response times. Use an inductor with a high self-resonant frequency that can withstand the currents required for the application. When using the other variants of the MSK 1932, place an additional bypass capacitor on pins 12 and 13 if series (Rp and Lp) components are not utilized. The pin should connect to +VHV with a short low impedance path. For additional applications information, please contact the factory. Evaluation amplifiers with test boards are readily available for MSK. NOTES: 5 Rev. B 8/00 MECHANICAL SPECIFICATIONS ESD TRIANGLE INDICATES PIN 1. TORQUE SPECIFICATION 3 TO 5 IN/LBS. ALL DIMENSIONS ARE 0.010 INCHES UNLESS OTHERWISE LABELED. ORDERING INFORMATION PART NUMBER MSK 1932S-0 MSK 1932D-0 MSK 1932U-0 MSK 1932S-2 MSK 1932D-2 MSK 1932U-2 MSK 1932S-4 MSK 1932D-4 MSK 1932U-4 MSK 1932S-6 MSK 1932D-6 MSK 1932U-6 LEAD OPTION STRAIGHT DOWN UP STRAIGHT DOWN UP STRAIGHT DOWN UP STRAIGHT DOWN UP +VHV MAX 110V 110V 75V 130V INTERNAL RP NONE 400 200 400 TYPICAL RISE TIME 3.5nS 2.8nS 1.7nS 6.0nS SCREENING LEVEL Industrial Industrial Industrial Industrial 4707 Dey Road, Liverpool, New York 13088 Phone (315) 701-6751 FAX (315) 701-6572 www.mskennedy.com The information contained herein is believed to be accurate at the time of printing. MSK reserves the right to make changes to its products or specifications without notice, however, and assumes no liability for the use of its products. M.S. Kennedy Corp. 6 Rev. B 8/00 |
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