AD9845B datasheet(20/24 Pages) AD

20 / 24 page

REV. A

–20–

AD9845B

CCD

CCDIN

BUFFER

VOUT

AD9845B

ADCOUT

DATA

SERIAL

INTERFACE

DIGITAL

OUTPUTS

DIGITAL IMAGE

PROCESSING

ASIC

TIMING

GENERATOR

V-DRIVE

CCD

TIMING

CDS/CLAMP

TIMING

0.1

Figure 32. System Applications Diagram

APPLICATIONS INFORMATION

The AD9845B 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 AD9845B analog input through a series input capacitor.

The AD9845B performs the dc restoration, CDS, gain adjust-

ment, black level correction, and analog-to-digital conversion.

The AD9845B’s digital output data is then processed by the

image processing ASIC. The internal registers of the

AD9845B—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.

AD9845B Datasheet(PDF) 20 Page - Analog Devices