ISO-9001 CERTIFIED BY DSCC ULTRA HIGH SPEED/VOLTAGE VIDEO AMPLIFIER 1922 SERIES M.S.KENNEDY CORP. 4707 Dey Road Liverpool, N.Y. 13088 (315) 701-6751 FEATURES: MIL-PRF-38534 CERTIFIED Ultra High Performance Complete Amplifier System 50Vpp Output Signal Into 10pF Ultra Fast Transition Times: 1.5nS @ 50Vpp User Adjustable Contrast and Brightness TTL Compatible Blanking On Board DC Reference Output Customized Versions Readily Available DESCRIPTION: The MSK 1922 High Speed, High Voltage Video Amplifier is designed to directly drive the cathode of today's high performance CRT's. The MSK 1922 has user adjustable contrast and brightness levels and also comes with a blanking function. The MSK 1922 can be directly connected to many video sources including RS170, RS343 and high speed video D/A converters. The MSK 1922 has an internal resistor-inductor designed for optimum bandwith. The MSK 1922 is packaged in a hermetic 30 pin power flatpack that can be directly connected to a heat sink using standard 4-40 screws. EQUIVALENT SCHEMATIC TYPICAL APPLICATIONS Helmet Mounted Displays High Resolution RGB Displays High Resolution Monochrome Displays Automatic Test Equipment Medical Monitors CAE/CAD Station Monitors PIN-OUT INFORMATION 1 2 3 4 5 6 7 8 9 10 GND GND Blank VEE VEE VEE -Input +Input GND GND 1 11 12 13 14 15 16 17 18 19 20 VGAIN VOFF VREF GND GND VHV RES VHV RES GND GND VHV 21 22 23 24 25 26 27 28 29 30 VHV NC Output NC Cath. RTN/GND VCC VCC GND GND GND Rev. D 4/02 ABSOLUTE MAXIMUM RATINGS +VHV VCC VEE VIN VIC VGAIN VOFF High Voltage Supply Positive Supply Voltage Negative Supply Voltage Differential Input Voltage Common Mode Input Voltage Gain Adjust Input Voltage Offset Adjust Input Voltage ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ +75V +17V -12V 2V ±2V -0.6 to +6V -0.6 to +6V ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ VBLANK IREF TST TLD ○ TJ IRP TC -0.6 to +6V Blank Input Voltage 5mA Reference Output Current Storage Temperature Range -40°C to +150°C 300°C Lead Temperature Range (10 Seconds) 175°C Junction Temperature 290mA Current Through Rp Case Operating Temperature -40°C to +125°C ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ELECTRICAL SPECIFICATIONS MSK1922 Test Conditions 1 Parameter Min. Typ. Max. Units STATIC 4 Quiescent Current VCM=0V @ +15V - 75 100 mA VCM=0V @ -10.5V - -75 -100 mA 30 70 75 V QOUT and QCAS - 24 26 °C/W 2 High Voltage Supply Thermal Resistance to Case 2 INPUT VCM=0V - ±1 ±50 µA VBLANK=0.4V - 500 600 µA VBLANK=2.4V - 300 400 µA VOFF=1V - 2 10 µA VGAIN=5V - 2 10 µA Normal Operation 30 - - nS VCM=±0.5V F=10Hz - 40 - dB Input Impedance 2 Either Input F=DC 10K 20K - Ω Input Capacitance 2 Either Input - 2 - pF - - ±2xRp mV 2 Input Bias Current 2 Blank Input Current Offset Adjust Input Current 2 Gain Adjust Input Current 2 Blank Input Pulse Width 2 Common Mode Rejection Ratio 2 VBLANK=2.4V VIN=0.3V Blank Mode Input Rejection ∆V 2 ∆V=VHV-VOUT 3 Gain Adjust Rejection ∆V 2 3 Power Supply Rejection Ratio 2 Internal Rp 2 ∆VGAIN=5V - - ±10xRp mV +VCC and -VEE=Nom ±5% 25 30 - dB 140 150 160 Ω 5.2 5.5 5.8 V -3xRp Rp 3xRp mV 3 OUTPUT Reference Output Voltage 4 IOUT<2mA ∆V=VHV-VOUT VOFF=1V ∆V Blank Mode 3 VBLANK=2.4V VGAIN=5V ∆V Min Offset 3 ∆V=VHV-VOUT VOFF=0V VGAIN=3V 0 2 6 V ∆V Max Offset 3 ∆V=VHV-VOUT VOFF=5V 11 16 21 V 40 54 64 V/V V VIN=0.6V F=10KHz Voltage Gain 4 VGAIN=4V Both Inputs Output Voltage High 4 VGAIN=4V F=10KHz 65 68 - Output Voltage Low 4 VGAIN=4V F=10KHz - 10 20 V VIN=0.6V TR=TF<0.2nS (input) - 1.5 - nS Linearity Error 2 VGAIN =4V VOFF=1V VCM=0.5V - - ±2 %GS Gain Linearity 2 VOFF=1V VIN=2.0V VCM=0.5V - - ±2 % - - ±2 %GS Transition Times Thermal Distortion 2 2 NOTES: 1 2 3 4 +VCC = +15V, -VEE = -10.5V, VBLANK = VGAIN = VOFF = ±VIN = 0V, CL=10pF, TC=25°C unless otherwise specified. This parameter is guaranteed by design but need not be tested. Typical parameters are representative of actual device performance but are for reference only. ∆V is defined as the difference between +VHV and the output. Parameter is 100% tested on production devices. 2 Rev. D 4/02 APPLICATION NOTES 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 1922 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 25Ω resistor to ground if input offset currents are to be minimized. POWER SUPPLIES The input stage of the MSK 1922 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 1922 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. OUTPUT PROTECTION The output pin of the MSK 1922 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 (25-50Ω) 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. The high voltage power supply (+VHV) is connected to the amplifier's output stage and must be kept as stable as possible. The internal 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. 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 73V/V. The VGAIN input should be connected to the VREF pin through a 5KΩ pot to ground. For convenient stable gain adjustment, 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 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. 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. The overall video output of the MSK 1922 can be characterized using the following expression: Vpp=VHV-VOUT VIDEO OUTPUT VHV-VOUT=(VIN)(VGAIN)(Rp)(0.09) (or) Voltage Gain=VOUT/VIN=(VGAIN)(Rp)(0.09) 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 the MSK 1922 is determined by (Rp). The bandwidth of the amplifier largely depends on both Rp and Lp. Here is a sample calculation for the MSK 1922: Given information VIN=0.7V VGAIN=1VDC Rp=150Ω (internal) VHV=70VDC VHV-VOUT=(0.7V)(1V)(150Ω)(0.09) VHV-VOUT=9.5V Nominal Hybrid pins 16 and 17 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 capacitance and the layout should minimize capacitive coupling to ground (ie: no ground plane under Rp). The expected video output would swing from approximately +70V to +60.5 V 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 should be buffered with a suitable low drift op-amp for best tracking performance. The MSK 1922 is specified with no external Lp which yields about 10% overshoot. Additional peaking can be obtained by using a high self-resonant frequency inductor in series with pins 16 & 17. 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 0.0047µH. If external resistors or inductors are not used, be sure to connect high frequency bypass capacitors directly from pins 16 and 17 to ground. 3 Rev. D 4/02 APPLICATION NOTES CON'T VOFF CONTROL INPUT BLANK 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 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 0.1µF 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. 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 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. The gain adjust alone can set the AC current to 333mA (ie: 333mApp=50Vpp/150Ω). Typically, most applications use about 5V from +VHV for a black level. The MSK 1922 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 1922 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. The power dissipation of the amplifier depends mainly on the load requirements, bandwidth, pixel size, black level and the value of Rp. RESOLUTION TABLE FOR TYPICAL CRT'S Maximun Pixel Time Minimum Pixel Clock Frequency Required Rise Time at CRT Cathode Required System Bandwidth (F-3dB) 320 x 200 182nS 5MHz 60nS 6MHz 640 x 350 52nS 19MHz 17nS 20MHz 640 x 480 38nS 26MHz 12.5nS 28MHz 800 x 560 26nS 38MHz 8.6nS 41MHz 1024 x 900 12.6nS 80MHz 4.2nS 84MHz 1024 x 1024 11nS 90MHz 3.7nS 95MHz 1280 x 1024 8.9nS 112MHz 2.9nS 120MHz 1664 x 1200 5.8nS 170MHz 1.9nS 180MHz 2048 x 2048 2.8nS 360MHz 1nS 380MHz 4096 x 3300 860pS 1.2GHz 280pS 1.23GHz Display Resolution All data assumes retrace time equal to 30% of frame time and a 60Hz refresh rate. 4 Rev. D 4/02 TYPICAL CONNECTION CIRCUIT The connection circuit shown above is for the MSK 1922 evaluation board. For additional applications information, please contact the factory. Evaluation amplifiers with test boards are readily available from MSK. NOTES: 5 Rev. D 4/02 MECHANICAL SPECIFICATIONS ESD TRIANGLE INDICATES PIN 1. ALL DIMENSIONS ARE ±0.010 INCHES UNLESS OTHERWISE LABELED. ORDERING INFORMATION PART NUMBER SCREENING LEVEL MSK 1922 Industrial M.S. Kennedy Corp. 4707 Dey Road, Liverpool, New York 13088 Phone (315) 701-6751 FAX (315) 701-6752 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. Please visit our website for the most recent revision of this datasheet. 6 Rev. D 4/02