AD9845 Analog Devices, AD9845 Datasheet - Page 20

• Manufacturer Part Number: AD9845
• Description: Complete 12-Bit 30 MSPS CCD Signal Processor
• Manufacturer: Analog Devices

AD9845A
APPLICATIONS INFORMATION
The AD9845A is a complete Analog Front End (AFE) product
for digital still camera and camcorder applications. As shown in
Figure 32, the CCD image (pixel) data is buffered and sent to
the AD9845A analog input through a series input capacitor.
The AD9845A performs the dc restoration, CDS, gain adjust-
ment, black level correction, and analog-to-digital conversion.
V-DRIVE
CCD
V
OUT
BUFFER
0.1 F
TIMING
CCD
CCDIN
GENERATOR
AD9845A
TIMING
REGISTER
CDS/CLAMP
TIMING
ADC
The AD9845A’s digital output data is then processed by the
image processing ASIC. The internal registers of the AD984x—
used to control gain, offset level, and other functions—are
programmed by the ASIC or microprocessor through a 3-wire
serial digital interface. A system timing generator provides the
clock signals for both the CCD and the AFE.
DATA
OUT
OUTPUTS
INTERFACE
DIGITAL
SERIAL
DIGITAL IMAGE
PROCESSING
ASIC