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AD9844A Datasheet(PDF) 1 Page - Analog Devices |
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AD9844A Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 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 AD9844A 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., 2000 Complete 12-Bit 20 MSPS CCD Signal Processor 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 12 CDS VGA CLP BUF 2:1 MUX CLP AD9844A 4dB 6dB INTERNAL REGISTERS CLP 12-BIT ADC 6 FEATURES 20 MSPS Correlated Double Sampler (CDS) 4 dB 6 dB Variable CDS Gain with 6-Bit Resolution 2 dB to 36 dB 10-Bit Variable Gain Amplifier (VGA) Low Noise Clamp Circuits Analog Preblanking Function 12-Bit 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 PC Cameras PRODUCT DESCRIPTION The AD9844A is a complete analog signal processor for CCD applications. It features a 20 MHz single-channel architecture designed to sample and condition the outputs of interlaced and progressive scan area CCD arrays. The AD9844A’s signal chain consists of an input clamp, correlated double sampler (CDS), digitally controlled variable gain amplifier (VGA), black level clamp, and 12-bit A/D converter. 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 AD9844A operates from a single 3 V power supply, typi- cally dissipates 78 mW, and is packaged in a 48-lead LQFP. |
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