參數(shù)資料
型號: AD9848KST
廠商: ANALOG DEVICES INC
元件分類: 消費家電
英文描述: CCD Signal Processors with Integrated Timing Driver
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP48
封裝: PLASTIC, LQFP-48
文件頁數(shù): 11/36頁
文件大?。?/td> 347K
代理商: AD9848KST
REV. 0
AD9848/AD9849
–11–
SYSTEM OVERVIEW
CCD
SERIAL
INTERFACE
DOUT
DIGITAL IMAGE
PROCESSING
ASIC
V-DRIVER
HD, VD
CLI
V1
V4, VSG1
VSG8, SUBCK
H1
H4, RG
CCDIN
AD9848/AD9849
INTEGRATED
AFE+TD
Figure 1a. Typical Application (Internal Mode)
CCD
SERIAL
INTERFACE
DOUT
DIGITAL IMAGE
PROCESSING
ASIC
V-DRIVER
HD, VD
CLI
V1
V4, VSG1
VSG8, SUBCK
H1
H4, RG
CCDIN
AD9848/AD9849
INTEGRATED
AFE+TD
PBLK
HBLK
CLPDM
CLPOB
Figure 1b. Typical Application (External Mode)
Figure 1a and 1b show the typical system application diagrams
for the AD9848/AD9849. The CCD output is processed by the
AD9848/AD9849’s AFE circuitry, which consists of a CDS,
PxGA
, VGA, black level clamp, and A/D converter. The digi-
tized pixel information is sent to the digital image processor
chip, where all post-processing and compression occurs. To
operate the CCD, CCD timing parameters are programmed
into the AD9848/AD9849 from the image processor, through
the 3-wire serial interface. From the system master clock, CLI,
provided by the image processor, the AD9848/AD9849 gener-
ates the high speed CCD clocks and all internal AFE clocks. All
AD9848/AD9849 clocks are synchronized with VD and HD.
Figure 1a shows the AD9848/AD9849 used in Internal mode,
in which all the horizontal pulses (CLPOB, CLPDM, PBLK,
and HBLK) are programmed and generated internally. Figure 1b
shows the AD9848/AD9849 operating in external mode, in
which the horizontal pulses are supplied externally by the
image processor.
The H-drivers for H1–H4 and RG are included in the AD9848/
AD9849, allowing these clocks to be directly connected to the
CCD. H-drive voltage of 5 V is supported in the AD9849.
Figure 2 shows the horizontal and vertical counter dimensions
for the AD9848/AD9849. All internal horizontal clocking is
programmed using these dimensions, to specify line and
pixel locations.
MAXIMUM FIELD DIMENSIONS
12-BIT HORIZONTAL = 4096 PIXELS MAX
12-BIT VERTICAL = 4096 LINES MAX
Figure 2. Vertical and Horizontal Counters
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