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AD9841AJST Datasheet(PDF) 1 Page - Analog Devices |
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AD9841AJST Datasheet(HTML) 1 Page - Analog Devices |
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1 / 23 page  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. a AD9841A/AD9842A One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2001 Complete 20 MSPS CCD Signal Processors FUNCTIONAL BLOCK DIAGRAM DATACLK SHD SHP BANDGAP REFERENCE 2:1 MUX DOUT AUX2IN CLPDM CCDIN OFFSET DAC PBLK AUX1IN VRT VRB INTERNAL TIMING INTERNAL BIAS 2dB–36dB AVDD DVDD DVSS AVSS DRVDD DRVSS 10 8 CML DIGITAL INTERFACE SDATA SCK SL CLPOB 10/12 CDS VGA CLP BUF 2:1 MUX CLP AD9841A/AD9842A CONTROL REGISTERS CLP ADC 4dB 6dB COLOR STEERING HD VD PxGA 6 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 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. PxGA is a registered trademark of Analog Devices, Inc. |
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