AD9937KCP Analog Devices Inc, AD9937KCP Datasheet - Page 20

• Manufacturer Part Number: AD9937KCP
• Manufacturer: Analog Devices Inc

Specifications of AD9937KCP

• Analog Front End Type: CCD
• Analog Front End Category: Video
• Interface Type: Serial (3-Wire)
• Input Voltage Range: 0.5V
• Operating Supply Voltage (min): 2.7V
• Operating Supply Voltage (typ): 3V
• Operating Supply Voltage (max): 3.6V
• Resolution: 10b
• Number Of Adc's: 1
• Power Supply Type: Analog/Digital
• Operating Temp Range: -25C to 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 56
• Package Type: LFCSP EP
• Number Of Channels: 1
• Lead Free Status / RoHS Status: Not Compliant

AD9937
SYSTEM OVERVIEW
Figure 8 shows the typical system block diagram for the AD9937.
The CCD output is processed by the AD9937’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 AD9937 from the system micropro-
cessor, through the 3-wire serial interface. From the system
master clock, VCKM provided by the image processor or exter-
nal crystal, the AD9937 generates all of the CCD’s horizontal
and vertical clocks and all internal AFE clocks.
V-DRIVE
Figure 8. Typical System Block Diagram, Master Mode
CCD
V
OUT
VCKM
HD
VD
BUFFER
TIMING
CCD
0.1 F
MAX VD LENGTH IS 2048 LINES
CCDIN
GENERATOR
AD9937
C
TIMING
REGISTER
IN
ADC
DATA
OUT
INTERFACE
OUTPUTS
DIGITAL
SERIAL
Figure 10. Maximum VD/HD Dimensions
MAX HD LENGTH IS 4095 PIXELS
DIGITAL IMAGE
PROCESSING
ASIC
–20–
The H-drivers for H1(A–D) and H2(A,B), and RS are included
in the AD9937, allowing these clocks to be directly connected
to the CCD. H-drive voltage of up to 3.6 V is supported. An
external V-driver is required for the vertical transfer clocks and
sensor gate pulses.
Figure 9 shows the horizontal and vertical counter dimensions
for the AD9937. All internal horizontal and vertical clocking is
programmed using these dimensions to specify line and pixel
locations.
Figure 9. Horizontal and Vertical Counters
12-BIT HORIZONTALCOUNTER = 4096 PIXELS MAX
MAXIMUM FIELD DIMENSIONS
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