AD9945(RevC) データシートの表示（PDF） - Analog Devices

部品番号

コンポーネント説明

メーカー

AD9945
(Rev.:RevC)

Complete 12-Bit 40 MHz CCD Signal Processor

Analog Devices 

AD9945

APPLICATIONS INFORMATION

The AD9945 is a complete analog front end (AFE) product for

digital still camera and camcorder applications. As shown in

Figure 10, the CCD image (pixel) data is buffered and sent to the

AD9945 analog input through a series input capacitor. The

AD9945 performs the dc restoration, CDS, gain adjustment, black

level correction, and analog-to-digital conversion. The AD9945’s

digital output data is then processed by the image processing

ASIC. The internal registers of the AD9945—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.

CCD

VOUT

V-DRIVE

BUFFER

0.1␮F

AD9945

CCDIN

ADCOUT

REGISTER-

DATA

DIGITAL

OUTPUTS

SERIAL

INTERFACE

CCD

TIMING

CDS/CLAMP

TIMING

TIMING

GENERATOR

DIGITAL IMAGE

PROCESSING

ASIC

Figure 10. System Applications Diagram

–12–

REV. C

Share Link: