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AD9845A Datasheet(PDF) 1 Page - Analog Devices |
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AD9845A Datasheet(HTML) 1 Page - Analog Devices |
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1 / 22 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 AD9845A 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 12-Bit 30 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 AD9845A CONTROL REGISTERS CLP ADC 4dB 6dB COLOR STEERING HD VD PxGA 6 FEATURES 30 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 12-Bit 30 MSPS A/D Converter Auxiliary Inputs with VGA and Input Clamp 3-Wire Serial Digital Interface 3 V Single Supply Operation Low Power: 140 mW @ 3 V Supply 48-Lead LQFP Package APPLICATIONS Digital Still Cameras Digital Video Camcorders Industrial Imaging PRODUCT DESCRIPTION The AD9845A is a complete analog signal processor for CCD applications. It features a 30 MHz single-channel architecture designed to sample and condition the outputs of interlaced and progressive scan area CCD arrays. The AD9845A’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 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 AD9845A operates from a single 3 V power supply, typi- cally dissipates 140 mW, and is packaged in a 48-lead LQFP. PxGA is a registered trademark of Analog Devices, Inc. |
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