
REV. 0
AD9846A
–20–
CCD
CCDIN
BUFFER
VOUT
0.1 F
AD9846A
ADCOUT
REGISTER
DATA
SERIAL
INTERFACE
DIGITAL
OUTPUTS
DIGITAL IMAGE
PROCESSING
ASIC
TIMING
GENERATOR
V-DRIVE
CCD
TIMING
CDS/CLAMP
TIMING
Figure 32. System Applications Diagram
APPLICATIONS INFORMATION
The AD9846A 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 AD9846A analog input through a series input capacitor. The
AD9846A performs the dc restoration, CDS, gain adjustment,
black level correction, and analog-to-digital conversion. The
AD9846A’s digital output data is then processed by the image
processing ASIC. The internal registers of the AD9846A—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.