AD9945 Analog Devices, AD9945 Datasheet
AD9945
Manufacturer Part Number
AD9945
Description
Complete 12-Bit 40 MHz CCD Signal Processor
Manufacturer
Analog Devices
Datasheet
1.AD9945.pdf
(16 pages)
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REV. A
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 that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
FEATURES
40 MSPS Correlated Double Sampler (CDS)
6 dB to 40 dB 10-Bit Variable Gain Amplifier (VGA)
Low Noise Optical Black Clamp Circuit
Preblanking Function
12-Bit 40 MSPS A/D Converter
No Missing Codes Guaranteed
3-Wire Serial Digital Interface
3 V Single-Supply Operation
Low Power: 140 mW @ 3 V Supply
Space-Saving 32-Lead 5 mm
APPLICATIONS
Digital Still Cameras
Digital Video Camcorders
PC Cameras
Portable CCD Imaging Devices
CCTV Cameras
CCDIN
AVDD
AVSS
AD9945
5 mm LFCSP
CDS
SL
REGISTERS
INTERFACE
CONTROL
6dB TO 40dB
DIGITAL
FUNCTIONAL BLOCK DIAGRAM
10
VGA
SCK
SDATA
GENERAL DESCRIPTION
The AD9945 is a complete analog signal processor for CCD
applications. It features a 40 MHz single-channel architecture
designed to sample and condition the outputs of interlaced and
progressive scan area CCD arrays. The AD9945’s signal chain
consists of a correlated double sampler (CDS), a digitally con-
trolled variable gain amplifier (VGA), a black level clamp, and a
12-bit A/D converter.
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 AD9945 operates from a single 3 V power supply, typi-
cally dissipates 140 mW, and is packaged in a space-saving
32-lead LFCSP.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
REFT REFB
REFERENCE
BAND GAP
12-BIT
CLP
ADC
SHP
Complete 12-Bit 40 MHz
INTERNAL
TIMING
SHD
CCD Signal Processor
© 2003 Analog Devices, Inc. All rights reserved.
PBLK
DATACLK
12
DRVDD
DRVSS
DOUT
CLPOB
DVDD
DVSS
AD9945
www.analog.com
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