AD9841A View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD9841A

Complete 20 MSPS CCD Signal Processors

Analog Devices 

APPLICATIONS INFORMATION

The AD9841A and AD9842A are complete Analog Front End

(AFE) products for digital still camera and camcorder appli-

cations. As shown in Figure 32, the CCD image (pixel) data is

buffered and sent to the AD984xA analog input through a series

input capacitor. The AD984xA performs the dc restoration,

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

AD9841A/AD9842A

digital conversion. The AD984xA’s digital output data is then

processed by the image processing ASIC. The internal regis-

ters of the AD984xA—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 gen-

erator provides the clock signals for both the CCD and the AFE.

CCD

VOUT

V-DRIVE

BUFFER

0.1␮F

AD984xA

CCDIN

ADCOUT

REGISTER

DATA

DIGITAL

OUTPUTS

SERIAL

INTERFACE

CCD

TIMING

CDS/CLAMP

TIMING

TIMING

GENERATOR

DIGITAL IMAGE

PROCESSING

ASIC

Figure 32. AD984xA System Applications Diagram

SERIAL

3

INTERFACE

3V

ANALOG SUPPLY

0.1␮F

1.0␮F

1.0␮F

0.1␮F

DATA 10

OUTPUTS

NC 1

NC 2

(LSB) D0 3

D1 4

D2 5

D3 6

D4 7

D5 8

D6 9

D7 10

D8 11

(MSB) D9

12

48 47 46 45 44 43 42 41 40 39 38 37

PIN 1

IDENTIFIER

AD9841A

TOP VIEW

(Not to Scale)

36 AUX1IN

AVSS

35

34 AUX2IN

33 AVDD2

32 BYP4

31 NC

30 CCDIN

29 BYP2

28 BYP1

27 AVDD1

26 AVSS

25 AVSS

13 14 15 16 17 18 19 20 21 22 23 24

0.1␮F

0.1␮F

3V

ANALOG SUPPLY

0.1␮F

0.1␮F

CCD SIGNAL

0.1␮F

0.1␮F

3V

ANALOG SUPPLY

3V

DRIVER

SUPPLY

0.1␮F

NC = NO CONNECT

8

CLOCK

INPUTS

0.1␮F

3V

ANALOG SUPPLY

Figure 33. AD9841A Recommended Circuit Configuration for CCD-Mode

REV. 0

–21–

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