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AD9701 Datasheet(PDF) 5 Page - Analog Devices |
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AD9701 Datasheet(HTML) 5 Page - Analog Devices |
5 / 6 page –5– REV. A AD9701 DIE LAYOUT AND MECHANICAL INFORMATION Die Dimensions . . . . . . . . . . . . . . . . 107 104 15 ( ±2) mils Pad Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 4 mils Metalization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aluminum Backing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . None Substrate Potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –VS Passivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Oxynitride Die Attach . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Gold Eutectic Bond Wire . . . . . . . 1.25 mil Aluminum; Ultrasonic Bonding or 1 mil Gold; Gold Ball Bonding APPLICATIONS INFORMATION Raster scan video displays image data on a line by line basis, with timing and control signals inserted between the lines. The control signals include the horizontal synchronization pulses, which are used to align the display circuitry at the beginning of each line. After the complete video image is displayed on the monitor, the process begins again with the next image. The ver- tical reset pulse(s) that initiate this timing sequence are located between each video image. Raster Graphics Configuration for TTL Systems The image data is distinguished from the timing information by its location relative to the blanking level. The blanking reference level is at the blackest extreme of the image data and all timing signals are designed to fall below the blanking level so as not to be seen on the monitor. The actual image data is located above the blanking level and it may be further separated from the tim- ing signal by the setup level. The setup level is simply a buffer zone between the timing and image data. Generation of the timing signals for the AD9701 is controlled by the COMPOSITE BLANKING and the COMPOSITE SYNC inputs. In normal operation, the output level of the AD9701 is forced to the blanking level (black) with the COM- POSITE BLANKING control so that when the synchronization occurs, it will not interfere (be seen) with the monitor image. The COMPOSITE SYNC control forces the output level below the blanking level, generating the synchronization pulse. The “grey scale” is the image intensity range located above the blanking level by the amount of the setup level. The setup level is “reference black,” the darkest displayable picture intensity. The top of the “grey scale” is “reference white” or the brightest picture intensity. As an 8-bit device, the AD9701 divides the “gray scale” into 256 individual levels. Normal raster scan waveforms divide the region between the blanking level and reference white into 100 IRE units (Interna- tional Radio Engineers). The setup level can range from 0 to 20 IRE units but typically is around 10 IRE units, and the synchro- nization pulse level typically falls 40 IRE units below the blank- ing level. For the AD9701, the reference white level is 10 IRE units below the full-scale output range (0 mAOUT). In terms of priority, the REFERENCE WHITE control over- rides the data inputs, but both COMPOSITE SYNC and COMPOSITE BLANKING override the data inputs and the REFERENCE WHITE control. A fourth control is active at all times, 10% BRIGHT, which adds approximately 10 IRE units to the output level no matter what the input state of the AD9701. The 10% BRIGHT control is primarily used to high- light areas of the video image. As with any high-speed device, the AD9701 requires a substan- tial low impedance ground plane and high quality ground con- nections to achieve the best performance. Performance can also be improved with adequate power supply decoupling near the supply pins of the AD9701. In ECL mode, the output of the AD9701 is designed to drive 75 Ω cable directly, with 75 Ω ter- minations to ground at both ends of the cable. For TTL con- figurations, the output should be terminated to +5.0 V through an 82 Ω resistor (see circuit below). Standard Reconstruction Configuration |
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