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AD9891 датащи(PDF) 11 Page - Analog Devices |
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AD9891 датащи(HTML) 11 Page - Analog Devices |
11 / 58 page REV. A AD9891/AD9895 –11– SYSTEM OVERVIEW Figure 5 shows the typical system block diagram for the AD9891/ AD9895 used in Master Mode. The CCD output is processed by the AD9891/AD9895’s AFE circuitry, which consists of a CDS, PxGA, VGA, black level clamp, and an A/D converter. The digi- tized pixel information is sent to the digital image processor chip, which performs the post-processing and compression. To operate the CCD, all CCD timing parameters are programmed into the AD9891/AD9895 from the system microprocessor, through the 3-wire serial interface. From the system master clock, CLI, pro- vided by the image processor or external crystal, the AD9891/ AD9895 generates all of the CCD’s horizontal and vertical clocks and all internal AFE clocks. External synchronization is provided by a SYNC pulse from the microprocessor, which will reset internal counters and resync the VD and HD outputs. CCDIN MSHUT STROBE H1–H4, RG, VSUB V1–V4, VSG1–VSG8, SUBCK CCD V-DRIVER AD989x DIGITAL IMAGE PROCESSING ASIC P DOUT DCLK CLPOB/PBLK LD/FD HD, VD CLI SERIAL INTERFACE SYNC Figure 5. Typical System Block Diagram, Master Mode Alternatively, the AD9891/AD9895 may be operated in Slave Mode, in which the VD and HD are provided externally from the image processor. In this mode, all AD9891/AD9895 timing will be synchronized with VD and HD. The H-drivers for H1–H4 and RG are included in the AD9891/ AD9895, allowing these clocks to be directly connected to the CCD. H-drive voltage of up to 5 V is supported. An external V-driver is required for the vertical transfer clocks, the sensor gate pulses, and the substrate clock. The AD9891/AD9895 also includes programmable MSHUT and STROBE outputs, which may be used to trigger mechani- cal shutter and strobe (flash) circuitry. Figure 6 shows the horizontal and vertical counter dimensions for the AD9891/AD9895. All internal horizontal and vertical clocking is programmed using these dimensions to specify line and pixel locations. 12-BIT HORIZONTAL = 4096 PIXELS MAX 12-BIT VERTICAL = 4096 LINES MAX MAXIMUM FIELD DIMENSIONS Figure 6. Vertical and Horizontal Counters |
Аналогичный номер детали - AD9891 |
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Аналогичное описание - AD9891 |
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