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AD9949 Datenblatt(PDF) 11 Page - Analog Devices |
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AD9949 Datenblatt(HTML) 11 Page - Analog Devices |
11 / 36 page AD9949 Rev. B | Page 11 of 36 SYSTEM OVERVIEW CCD SERIAL INTERFACE DOUT DIGITAL IMAGE PROCESSING ASIC V-DRIVER HD, VD CLI V1 TO Vx, VSG1 TO VSGx, SUBCK H1 TO H4, RG CCDIN AD9949 INTEGRATED AFE + TD Figure 11. Typical Application Figure 11 shows the typical system application diagram for the AD9949. The CCD output is processed by the AD9949’s AFE circuitry, which consists of a CDS, a PxGA, a VGA, a black level clamp, and an ADC. The digitized pixel information is sent to the digital image processor chip where all postprocessing and compression occurs. To operate the CCD, CCD timing parameters are programmed into the AD9949 from the image processor through the 3-wire serial interface. From the system master clock, CLI, provided by the image processor, the AD9949 generates the high speed CCD clocks and all internal AFE clocks. All AD9949 clocks are synchronized with VD and HD. The AD9949’s horizontal pulses (CLPOB, PBLK, and HBLK) are programmed and generated internally. The H-drivers for H1 to H4 and RG are included in the AD9949, allowing these clocks to be directly connected to the CCD. The H-drive voltage of 3 V is supported in the AD9949. Figure 12 shows the horizontal and vertical counter dimensions for the AD9949. All internal horizontal clocking is programmed using these dimensions to specify line and pixel locations. H-COUNTER BEHAVIOR When the maximum horizontal count of 4096 pixels is exceeded, the H-counter in the AD9949 rolls over to zero and continues counting. It is, therefore, recommended that the maximum counter value not be exceeded. However, the newer AD9949A version behaves differently. In the AD9949A, the internal H-counter holds at its maximum count of 4095 instead of rolling over. This feature allows the AD9949A to be used in applications containing a line length greater than 4096 pixels. Although no programmable values for the horizontal blanking or clamping are available beyond pixel 4095, the H, RG, and AFE clocking continues to operate, sampling the remaining pixels on the line. MAXIMUM FIELD DIMENSIONS 12-BIT HORIZONTAL = 4096 PIXELS MAX 12-BIT VERTICAL = 4096 LINES MAX Figure 12. Vertical and Horizontal Counters VD HD CLI MAX HD LENGTH IS 4095 PIXELS MAX VD LENGTH IS 4095 LINES Figure 13. Maximum VD/HD Dimensions |
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Ähnliche Beschreibung - AD9949 |
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