AD9841A Datasheet, PDF (1/23 Pages) Analog Devices – Complete 20 MSPS CCD Signal Processors

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FEATURES
20 MSPS Correlated Double Sampler (CDS)
4 dB ؎ 6 dB 6-Bit Pixel Gain Amplifier (PxGA^®)
2 dB to 36 dB 10-Bit Variable Gain Amplifier (VGA)
Low Noise Clamp Circuits
Analog Preblanking Function
10-Bit (9841) or 12-Bit (9842) 20 MSPS A/D Converter
Auxiliary Inputs with VGA and Input Clamp
3-Wire Serial Digital Interface
3 V Single Supply Operation
Low Power: 65 mW @ 2.7 V Supply
48-Lead LQFP Package
APPLICATIONS
Digital Still Cameras
Digital Video Camcorders
Complete 20 MSPS
CCD Signal Processors
AD9841A/AD9842A
PRODUCT DESCRIPTION
The AD9841A and AD9842A are complete analog signal proces-
sors for CCD applications. Both products feature a 20 MHz
single-channel architecture designed to sample and condition
the outputs of interlaced and progressive scan area CCD arrays.
The AD9841A/AD9842A’s signal chain consists of an input
clamp, correlated double sampler (CDS), Pixel Gain Amplifier
(PxGA), digitally controlled variable gain amplifier (VGA),
black level clamp, and A/D converter. The AD9841A offers 10-bit
ADC resolution, while the AD9842A contains a true 12-bit
ADC. Additional input modes are provided for processing analog
video signals.
The internal registers are programmed through a 3-wire serial
digital interface. Programmable features include gain adjustment,
black level adjustment, input configuration, and power-down modes.
The AD9841A and AD9842A operate from a single 3 V power
supply, typically dissipate 78 mW, and are packaged in a 48-
lead LQFP.
CCDIN
CLPDM
AUX1IN
AUX2IN
FUNCTIONAL BLOCK DIAGRAM
PBLK
AVDD
AVSS
HD
VD
CLPOB
4dB ؎ 6dB
CDS
PxGA
CLP
6
2:1
MUX
BUF
CLP
AD9841A/AD9842A
COLOR
STEERING
2:1
MUX
2dB–36dB
VGA
CLP
ADC
10/12
DRVDD
DRVSS
DOUT
OFFSET
10
DAC
8
CONTROL
REGISTERS
DIGITAL
INTERFACE
BANDGAP
REFERENCE
INTERNAL
BIAS
INTERNAL
TIMING
VRT
VRB
CML
DVDD
DVSS
SL
SCK SDATA
SHP SHD DATACLK
PxGA is a registered trademark of Analog Devices, Inc.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
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© Analog Devices, Inc., 2001