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MSK1932D-4 Datasheet(PDF) 4 Page - M.S. Kennedy Corporation |
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MSK1932D-4 Datasheet(HTML) 4 Page - M.S. Kennedy Corporation |
4 / 6 page 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 normally generated by connecting the VOFF control pin to a 5K potenti- ometer 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. 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 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 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. 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: 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 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 RESOLUTION TABLE FOR TYPICAL CRT'S All data assumes retrace time equal to 30% of frame time and a 60Hz refresh rate. DEVICE TYPE 1932-6 1932-6 1932-4 1932-4 120V 120V 70V 70V OUTPUT AVE. Pd 0W 13.3W 0W 8.4W TOTAL AVE. Pd 2.5W 15.7W 2.5W 10.6W WHITE 0% 40% 0% 40% BLANK 100% 20% 100% 20% OUTPUT VOLTAGE 0V 90V 0V 50V WHITE LEVEL 20V 20V 15V 15V BLACK LEVEL 110V 110V 65V 65V +VHV BLACK 0% 40% 0% 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 8/00 4 |
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