Datasheet

AD9943/AD9944
Rev. B | Page 18 of 20
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
CCDIN
BUFFER
V
OUT
AD9943/AD9944
ADC
OUT
REGISTER
DATA
SERIAL
INTERFACE
DIGITAL
OUTPUTS
DIGITAL IMAGE
PROCESSING
ASIC
TIMING
GENERATOR
V-DRIVE
CCD
TIMING
CDS/CLAMP
TIMING
0.1µF
02905-B-017
Figure 16. System Applications Diagram
24 REFB
23 REFT
22 CCDIN
21 AVSS
D0 1
D1 2
D2 3
NC
20 AVDD
19 SHD
18 SHP
17 CLPOB
D3 4
D4 5
D5 6
D6 7
D7 8
DATA
OUTPUTS
10
D8 D9
910
3V
DRIVER
SUPPLY
3V
ANALOG
SUPPLY
3V
ANALOG
SUPPLY
DRVDD
DRVSS
DVDD
DATACLK
DVSS PBLK
12 13 14 15 16
5
CLOCK
INPUTS
3
SERIAL
INTERFACE
CCDIN
AD9943
(Not to Scale)
TOP VIEW
1.0µF
1.0µF
0.1µF
0.1µF
0.1µF
0.1µF
NC = NO CONNECT
PIN 1
IDENTIFIER
32 31 30 29 28 27 26 25
NC NC NC NC SCK SDTA SL
11
02905-B-018
Figure 17. AD9943 Recommended Circuit Configuration for CCD Mode