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AD9995 Datasheet(PDF) 9 Page - Analog Devices |
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AD9995 Datasheet(HTML) 9 Page - Analog Devices |
9 / 60 page AD9995 –9– SYSTEM OVERVIEW Figure 1 shows the typical system block diagram for the AD9995 used in Master mode. The CCD output is processed by the AD9995’s AFE circuitry, which consists of a CDS, VGA, black level clamp, and A/D converter. The digitized pixel information is sent to the digital image processor chip, which performs the postprocessing and compression. To operate the CCD, all CCD timing parameters are programmed into the AD9995 from the system microprocessor through the 3-wire serial interface. From the system master clock, CLI, provided by the image processor or external crystal, the AD9995 generates all of the CCD’s hori- zontal and vertical clocks and all internal AFE clocks. External synchronization is provided by a SYNC pulse from the micropro- cessor, which will reset internal counters and resync the VD and HD outputs. Alternatively, the AD9995 may be operated in Slave mode, in which VD and HD are provided externally from the image pro- cessor. In this mode, all AD9995 timing will be synchronized with VD and HD. CCDIN MSHUT STROBE H1–H4, RG, VSUB V1–V6, VSG1–VSG5, SUBCK CCD V-DRIVER AD9995 AFETG DIGITAL IMAGE PROCESSING ASIC DOUT DCLK HD, VD CLI SERIAL INTERFACE SYNC The H-drivers for H1–H4 and RG are included in the AD9995, allowing these clocks to be directly connected to the CCD. H-drive voltage of up to 3.3 V is supported. An external V-driver is required for the vertical transfer clocks, the sensor gate pulses, and the substrate clock. The AD9995 also includes programmable MSHUT and STROBE outputs, which may be used to trigger mechanical shutter and strobe (flash) circuitry. Figures 2 and 3 show the maximum horizontal and vertical counter dimensions for the AD9995. All internal horizontal and vertical clocking is controlled by these counters to specify line and pixel locations. Maximum HD length is 4095 pixels per line, and maximum VD length is 4095 lines per field. 12-BIT HORIZONTAL = 4096 PIXELS MAX 12-BIT VERTICAL = 4096 LINES MAX MAXIMUM FIELD DIMENSIONS Figure 2. Vertical and Horizontal Counters VD HD MAX VD LENGTH IS 4095 LINES CLI MAX HD LENGTH IS 4095 PIXELS Figure 3. Maximum VD/HD Dimensions REV. 0 |
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