AD9944 データシートの表示（PDF） - Analog Devices

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AD9944

Complete 10-Bit and 12-Bit, 25 MHz CCD Signal Processors

Analog Devices 

AD9943/AD9944

APPLICATIONS INFORMATION

The AD9943/AD9944 are complete analog front end (AFE)

products for digital still camera and camcorder applications. As

shown in Figure 12, the CCD image (pixel) data is buffered and

sent to the AD9943/AD9944 analog input through a series input

capacitor. The AD9943/AD9944 perform the dc restoration,

CDS, gain adjustment, black level correction, and analog-to-

digital conversion. The AD9943/AD9944’s digital output data is

then processed by the image processing ASIC. The internal

registers of the AD9943/AD9944—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

0.1µF

AD9943/AD9944

CCDIN

ADCOUT

REGISTER

DATA

DIGITAL

OUTPUTS

SERIAL

INTERFACE

CCD

TIMING

CDS/CLAMP

TIMING

TIMING

GENERATOR

Figure 16. System Applications Diagram

DIGITAL IMAGE

PROCESSING

ASIC

SERIAL

3

INTERFACE

32 31 30 29 28 27 26 25

D0 1

D1 2

D2 3

D3 4

D4 5

D5 6

D6 7

D7 8

PIN 1

IDENTIFIER

AD9943

TOP VIEW

(Not to Scale)

9 10 11 12 13 14 15 16

24 REFB

23 REFT

22 CCDIN

21 AVSS

20 AVDD

19 SHD

18 SHP

17 CLPOB

1.0µF

1.0µF

0.1µF

0.1µF

CCDIN

3V

ANALOG

SUPPLY

DATA 10

OUTPUTS

3V

DRIVER

SUPPLY

0.1µF

0.1µF

3V

ANALOG

SUPPLY

5

CLOCK

INPUTS

NC = NO CONNECT

Figure 17. AD9943 Recommended Circuit Configuration for CCD Mode

Rev. B | Page 18 of 20

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