MSK1902 MSK | Alldatasheet
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4707 Dey Road Liverpool, N.Y. 13088 (315) 701-6751 FEATURES: 100VPP Output Signal into 10PF Ultra Fast Transition Times-3nS User Adjustable Contrast and Brightness TTL Compatible Blanking On Board DC Reference Output Customized Versions Available Upon Request Available to DSCC SMD 5962-8997201HX MIL-PRF-38534 CERTIFIED ISO-9001 CERTIFIED BY DSCC M.S.KENNEDY CORP. 1902 DESCRIPTION: The MSK 1902 Series of high speed, high voltage video amplifiers was designed to drive the cathode of today's high performance CRT's. The MSK 1902 has user adjustable contrast and brightness levels and also comes with a blanking function. The MSK 1902 can be directly connected to many video sources including RS170, RS343 and high speed video D/A converters. The MSK 1902 is available in four versions for different applications. The MSK 1902-0 has no internal high voltage resistor or inductor allowing the user to dissipate much of the power externally. The MSK 1902-2, MSK 1902-4 and the MSK 1902-6 each have an internal resistor-inductor designed for optimum bandwidth. The MSK 1902-6 has slightly lower bandwidth but can be operated from up to +130V. Each version of the MSK 1902 is packaged in a 30 pin power flatpack that can be directly connected to a heat sink using standard 4-40 screws. EQUIVALENT SCHEMATIC Helmet Mounted Displays High Resolution RGB Displays High Resolution Monochrome Displays Automatic Test Equipment TYPICAL APPLICATIONS GND GND Blank VEE VEE VEE -Input +Input GND GND PIN-OUT INFORMATION +VHV NC Output NC Cath. Current RTN VCC VCC GND GND GND VGAIN VOFF VREF GND GND +VHV RES +VHV RES GND GND +VHV HIGH SPEED/HIGH VOLTAGE VIDEO AMPLIFIER Rev. B 2/03 SERIES
+110V +110V +75V +130V +17V -12V ±2V -0.6 to +6V -0.6 to +6V High Voltage Supply (1902-0) (1902-2) (1902-4) (1902-6) Positive Supply Voltage Negative Supply Voltage Differential Input Voltage Common Mode Input Voltage Gain Adjust Input Voltage Offset Adjust Input Voltage -0.6 to +6V 5mA -65°C to +150°C 300°C 175°C 290mA -55°C to +125°C -40°C to +85°C ABSOLUTE MAXIMUM RATINGS +VCC = +15V, -VEE = -10.5V, VBLANK =0.4V, VGAIN = VOFF = ±VIN = 0V, CL=10pF, VHV=typical value and TC=25°C unless otherwise specified. Guaranteed by design but not tested. Typical parameters are representative of actual device performance but are for reference only. RP=Internal RP except MSK 1902-0. External value = 400Ω unless otherwise specified for the MSK 1902-0. Industrial grade and "E" suffix devices shall be tested to subgroups 1 and 4 unless otherwise specified. Military grade devices ("B" suffix) shall be 100% tested to subgroups 1,2,3 and 4. Subgroups 5 and 6 testing available upon request. Subgroup 1,4 TA=TC=+25°C 2,5 TA=TC=+125°C 3,6 TA=TC=-55°C +VHV +VCC -VEE VIN VIC VGAIN VOFF Blank Input Voltage Reference Output Current Storage Temperature Range Lead Temperature Range (10 Seconds) Junction Temperature Current Through Rp Case Operating Temperature Range (All Devices B/E Suffix) (All Devices No Suffix) VBLANK IREF TST TLD TJ IRP TC ELECTRICAL SPECIFICATIONS NOTES: mA mA V °C/W µA µA µA µA µA µA nS dB KΩ pF mV dB Ω V V V V V/V V V nS %GS %GS Min. 190 5.2 Max. 100 -100 110 ±50 ±250 600 400 420 5.8 138 4.0 STATIC High Voltage Supply Thermal Resistance to Case INPUT Offset Adjust Input Current Gain Adjust Input Current Blank Input Pulse Width Common Mode Rejection Ratio Input Impedance Input Capacitance Blank Mode Input Rejection ∆V Gain Adjust Rejection ∆V Power Supply Rejection Ratio Internal Rp OUTPUT Reference Output Voltage ∆V Min Offset Voltage Gain Output Voltage High Output Voltage Low Transition Times Linearity Error Gain Linearity Thermal Distortion Parameter VCM=0V @ +15V VCM=0V @ -10.5V TC ≤ 125°C QOUT/QCAS VBLANK=0.4V VBLANK=2.4V VOFF=1V VGAIN=5V Normal Operation VCM=±0.5V F=10Hz Either Input F=DC Either Input VBLANK=2.4V VIN=0.3V ∆V=VHV-VOUT ∆VGAIN=5V +VCC and -VEE=Nom ±5% IOUT<2mA ∆V=VHV-VOUT VOFF=1V VBLANK=2.4V VGAIN=5V ∆V=VHV-VOUT VOFF=0V VGAIN=3V VIN=0.6V F=10KHz VGAIN=3V Both Inputs VGAIN=3V F=10KHz VGAIN=3V F=10KHz VIN=0.6V VOUT=Max TR=TF<0.5nS VGAIN =4V VOFF=1V VCM=0.5V VOFF=1V VIN=0.2V VCM=0.5V Test Conditions Max. 100 -100 130 ±50 ±250 600 400 420 5.8 145 Typ. -75 120 500 300 400 5.5 120 118 6.5 Min. 380 5.2 115 MSK1902-6 Max. 100 -100 ±50 ±250 600 400 210 5.8 2.8 Typ. -75 500 300 200 5.5 2.3 MSK1902-4 Typ. -75 100 500 300 400 5.5 110 3.4 Min. 380 5.2 MSK1902-2 Max. 100 -100 110 ±50 ±250 600 400 5.8 138 5.5 Typ. -75 100 500 300 5.5 110 4.0 Min. 5.2 MSK1902-0 mV ±2xRp ±2xRp ±2xRp ±2xRp 3xRp Rp -3xRp 3xRp Rp -3xRp 3xRp Rp -3xRp 3xRp Rp -3xRp mV Quiescent Current Input Bias Current Blank Input Current ∆V Blank Mode ∆V Max Offset ±10xRp ±10xRp ±10xRp ±10xRp Rev. B 2/03 Group A Subgroup 1,2,3 1,2,3 2,3 1,2,3 1,2,3 2,3 1,2,3 Units VCM=0V ∆V=VHV-VOUT VOFF=5V
The input stage of the MSK 1902 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 4.7µF) connected as close to the amplifier's pins as possible. The MSK 1902 has internal 0.01µF capacitors that also improve high frequency performance. In any case, it is also recommended to put 0.1µF 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 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 1902 variants is determined by Vpp = (250mA) x (Rp). The bandwidth of the amplifier largely depends on both Rp and Lp. Hybrid pins 16 and 17 are directly connected to Rp. Addi- tional external resistance can be added to reduce power dissi- pation, 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 1902 series is conservatively specified with low values for Lp which yield about 5% overshoot. Additional peak- ing can be obtained by using a high self-resonant frequency inductor in series with the Rp pins. Since this value of induc- tance can be very dependent on circuit layout, it is best to determine its value by experimentation. A good starting point is typically 0.47µH for the MSK 1902-0 and 0.0047µH for the remaining devices. If external resistors or inductors are not used, be sure to connect high frequency bypass capacitors directly from pins 16 and 17 to ground. 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 80V/V. The VGAIN input should be connected to the VREF pin through a 5KΩ pot to ground. For convenient stable gain adjust- ment, a 0.1µF 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 track- ing performance may be lost when using an external DC voltage source other than VREF for gain adjustment. The overall video output of the MSK 1902 can be character- ized using the following expression: Vpp=VHV-VOUT VHV-VOUT=(VIN) (VGAIN) (0.1) (Rp) (0.9) Here is a sample calculation for the MSK 1902-2: Given information: VIN=0.7V VGAIN=1VDC Rp=400Ω (internal) VHV=100VDC VHV-VOUT=(0.7V) (1V) (0.1) (400Ω) (0.9) 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 varia- tions. Changing ambient conditions can also affect 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 applica- tions such as RGB systems. Additionally, only one of the VREF outputs should be shared by all three amplifiers. This voltage should be buffered with a suitable low drift op-amp for best tracking performance. VGAIN CONTROL INPUT OUTPUT PROTECTION The output pin of the MSK 1902 should be protected from transients by connecting reverse 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 (50-100Ω) resistor in series with the amplifier out- put. This resistor will reduce system bandwidth along with the load capacitance, but a series inductor can reduce the problem substantially. VIDEO INPUTS The video input signals should be kept below ±2VMAX total, including both common mode offset and signal levels. The in- put structure of the MSK 1902 was designed for ±0.714Vpp RS343 signals. If either input is not used it should be con- nected directly to the analog ground or through a 25Ω resistor to ground if input offset currents are to be minimized. 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. Rev. B 2/03
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 (5µA) (Rp) to (100mA) (Rp) from +VHV. This control voltage is nor- mally generated by connecting the VOFF control pin to a 5K potentiometer between VREF and ground. The VOFF input pin should be bypassed with a 0.1µF capacitor to ground placed as close as possible to the hybrid. This DC voltage can be any stable system source. 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 obvi- ously dependent on system requirements but a little experi- mentation will strike the optimum balance between power dis- sipation and bandwidth. Total current through Rp should be limited to less than 290mA when operating from power sup- plies greater than 90V. The gain adjust alone can set the AC current to 250mA (ie: 250mApp=100Vpp/400Ω). Typically, most applications use about 10V from +VHV for a black level. BLANK INPUT The video input can be electrically disconnected from the amplifier 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 out- put 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 output. VREF OUTPUT The MSK 1902 has an on board buffered DC zener reference output. The VREF output is nominally 5.5V DC and has full tem- perature 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 1902 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: 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 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 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 RESOLUTION TABLE FOR A TYPICAL CRT All data assumes retrace time equal to 30% of frame time and a 60Hz refresh rate. 1902-6 1902-6 1902-4 1902-4 120V 120V 70V 70V 13.3W 8.4W 2.5W 15.7W 2.5W 10.6W WHITE 40% 40% BLANK 100% 20% 100% 20% 90V 50V 20V 20V 15V 15V 110V 110V 65V 65V +VHV BLACK 40% 40% PERCENT OF SIGNAL 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. Display Resolution Rev. B 2/03 TYPE DEVICE LEVEL BLACK LEVEL WHITE VOLTAGE OUTPUT AVE. Pd OUTPUT AVE. Pd TOTAL
NOTES: The connection circuit shown above is for the MSK 1902-0 evaluation board. The Rp and Lp are external compo- nents 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 1902, place an additional bypass capacitor on pins 16 and 17 if series (Rp and Lp) components are not utilized. The pin should connect to +VHV with a short low impedance path. For additional application information, please contact MSK. Evaluation amplifiers with test boards are available upon request. TYPICAL CONNECTION CIRCUIT Rev. B 2/03
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. Please visit our website for the most recent revision of this datasheet. M.S. Kennedy Corp.
4707 Dey Road, Liverpool, New York 13088
Phone (315) 701-6751 FAX (315) 701-6752 www.mskennedy.com Rev. B 2/03 PART NUMBER MSK 1902-0 MSK 1902B-0 MSK 1902E-0 5962-8997201HX MSK 1902-2 MSK 1902B-2 MSK1902E-2 5962-8997202HX MSK 1902-4 MSK 1902B-4 MSK1902E-4 MSK 1902-6 MSK 1902B-6 MSK1902E-6 +VHV MAX INTERNAL RP 4.0nS 4.0nS 4.0nS 4.0nS 3.4nS 3.4nS 3.4nS 3.4nS 2.3nS 2.3nS 2.3nS 6.5nS 6.5nS 6.5nS TYPICAL RISE TIME SCREENING LEVEL Industrial Mil-PRF-38534 Class H Extended Reliability DSCC-SMD Industrial Mil-PRF-38534 Class H Extended Reliability DSCC-SMD Industrial Mil-PRF-38534 Class H Extended Reliability Industrial Mil-PRF-38534 Class H Extended Reliability
ORDERING INFORMATION
ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED. ESD TRIANGLE INDICATES PIN 1. NONE NONE NONE NONE 400 400 400 400 200 200 200 400 400 400 110V 110V 110V 110V 110V 110V 110V 110V 75V 75V 75V 130V 130V 130V