AD9807JS 查看數據表（PDF） - Analog Devices
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AD9807JS Datasheet PDF : 24 Pages
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AD9807/AD9805
CIS Application
Unlike many other integrated circuit CCD signal processors, the
AD9807/AD9805 can easily be implemented in imaging systems
that do not use a CCD. By disabling the input clamp and the
CDS blocks, any dc coupled signal within the input limits of the
part can be digitized. Figure 23 shows a typical block diagram of
the AD9807 used with a color CIS module, in this case Dyna
Image Corporation’s DL100*. The three color output signals
are dc coupled into the AD9807. The Dyna CIS module’s
output levels are around 70 mV to 500 mV dark to bright, well
within the input range of the AD9807. The AD9807 is config-
ured for 3-channel SHA operation through the MPU registers.
Timing used with the Dyna DL100 is shown in Figure 24; the
CIS output levels are sampled on the falling edge of CDSCLK1.
The digital ASIC shown can be implemented in a variety of
ways: it could include the MPU interface and timing generator,
as well as memory for the output data and pixel gain and offset
correction vectors.
CIS RED
GREEN
BLUE
CIS
CLOCKS
PIXEL
12
GAIN
CORRECTION
GAIN<11:0>
VINR
DOUT<11:0>
VING
MPU<7:0>
VINB
AD9807
A2, A1, A0
OEB, WRB
STRTLN,
RDB, CSB
CDSCLK1,
ADCCLK OFFSET<7:0>
OUTPUT
12
DATA
7
8
3
TIMING
GENERATOR
8
MPU
PIXEL
INTERFACE
OFFSET
CORRECTION
DIGITAL
ASIC
Figure 23. CIS Application Diagram (Power, Ground, and
Decoupling Omitted)
CIS START PULSE
CIS CLOCK
CIS OUTPUT
STRTLN
ADCCLK
CDSCLK1
Figure 24. CIS Application Timing Signals
EVALUATION BOARDS
The AD9807 and AD9805 evaluation boards are designed to
provide an easy interface to a standard PC, simplifying the task
of evaluating the performance of the AD9807/AD9805 with an
existing imaging system. The system level block diagram shown
in Figure 25 illustrates the basic evaluation setup for the
AD9807 (the AD9805 is the same). The user needs to supply
the analog input signals (such as outputs from a CCD), the
AD9807/AD9805’s clock signals, a power supply and a printer
cable to connect the evaluation board to the PC’s parallel port.
Software is included to allow the user to easily accomplish three
major tasks: first, configure the AD9807/AD9805 in one of several
operating modes (1 Channel, 3 Channel, CDS or SHA mode,
etc.), second, acquire output data from the part and third, down-
load pixel gain and offset correction data to the evaluation board
and enable pixel rate shading and offset correction.
Figures 26 and 27 show the signal routing and decoupling for
the AD9807 evaluation board.
The evaluation boards are designated with the part numbers
AD9807-EB and AD9805-EB.
+5V VOLT
POWER
SUPPLY
ANALOG INPUTS
RED
GREEN
BLUE
CLOCK INPUTS
STRTLN
CDSCLK1
CDSCLK2
ADCCLK
AD9807 EVALUATION BOARD
VINR
VING
VINB
GAIN
OFFSET
AD9807
DOUT
MPU I/O
MPU CONTROL
CLOCKS
12
8
12
8
7
FIFO
BUFFERS,
LATCHES,
AND
8
CONTROL
LOGIC
4
PRINTER
CABLE
PC
PARALLEL
PORT
Figure 25. Evaluation System Block Diagram
*All trademarks are properties of their respective holders.
REV. 0
–21–
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