Complete 10-Bit and 12-Bit, 25 MHz
CCD Signal Processors
AD9943/AD9944
FEATURES
GENERAL DESCRIPTION
25 MSPS correlated double sampler (CDS)
6 dB to 40 dB 10-bit variable gain amplifier (VGA)
Low noise optical black clamp circuit
Preblanking function
10-bit (AD9943), 12-bit (AD9944) 25 MSPS A/D converter
No missing codes guaranteed
The AD9943/AD9944 are complete analog signal processors
for CCD applications. They feature a 25 MHz single-channel
architecture designed to sample and condition the outputs of
interlaced and progressive scan area CCD arrays. The signal
chain for the AD9943/AD9944 consists of a correlated double
sampler (CDS), a digitally controlled variable gain amplifier
(VGA), and a black level clamp. The AD9943 offers 10-bit
ADC resolution, while the AD9944 contains a true 12-bit ADC.
3-wire serial digital interface
3 V single-supply operation
Space-saving 32-lead 5 mm × 5 mm LFCSP package
The internal registers are programmed through a 3-wire
serial digital interface. Programmable features include gain
adjustment, black level adjustment, input clock polarity, and
power-down modes. The AD9943/AD9944 operate from a
single 3 V power supply, typically dissipate 79 mW, and are
packaged in space-saving 32-lead LFCSP packages.
APPLICATIONS
Digital still cameras
Digital video camcorders
PC cameras
Portable CCD imaging devices
CCTV cameras
FUNCTIONAL BLOCK DIAGRAM
REFT
REFB
PBLK
AD9943/AD9944
DRVDD
DRVSS
BAND GAP
REFERENCE
6dB–40dB
10/12
10-/12-BIT
ADC
CCDIN
DOUT
VGA
CDS
CLP
10
AVDD
AVSS
CLPOB
CONTROL
REGISTERS
DVDD
DVSS
DIGITAL
INTERFACE
INTERNAL
TIMING
SL
SCK
SDATA
SHP
SHD DATACLK
Figure 1. Functional Block Diagram
Rev. B
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