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AD9945KCP Datasheet(PDF) 1 Page - Analog Devices |
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AD9945KCP Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page 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. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved. AD9945 Complete 12-Bit 40 MHz CCD Signal Processor 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 5 mm LFCSP APPLICATIONS Digital Still Cameras Digital Video Camcorders PC Cameras Portable CCD Imaging Devices CCTV Cameras FUNCTIONAL BLOCK DIAGRAM DATACLK SHD SHP BAND GAP REFERENCE DOUT CCDIN PBLK REFT REFB INTERNAL TIMING 6dB TO 40dB AVDD DVDD DVSS AVSS DRVDD DRVSS 10 DIGITAL INTERFACE SDATA SCK SL CLPOB 12 AD9945 CONTROL REGISTERS 12-BIT ADC CLP VGA CDS 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. |
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