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AD9943KCPZRL1 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD9943KCPZRL1 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 20 page Complete 10-Bit and 12-Bit, 25 MHz CCD Signal Processors AD9943/AD9944 Rev. B 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. Specifications subject to change without notice. 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 © 2004 Analog Devices, Inc. All rights reserved. FEATURES 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 3-wire serial digital interface 3 V single-supply operation Space-saving 32-lead 5 mm × 5 mm LFCSP package APPLICATIONS Digital still cameras Digital video camcorders PC cameras Portable CCD imaging devices CCTV cameras GENERAL DESCRIPTION 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. 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. FUNCTIONAL BLOCK DIAGRAM DATACLK SHD SHP BAND GAP REFERENCE DOUT CCDIN PBLK REFT REFB INTERNAL TIMING 6dB–40dB AVDD DVDD DVSS AVSS DRVDD DRVSS 10 DIGITAL INTERFACE SDATA SCK SL CLPOB 10/12 CDS VGA CLP AD9943/AD9944 CONTROL REGISTERS 10-/12-BIT ADC Figure 1. Functional Block Diagram |
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