AD9945 Datasheet | Analog Devices

FEATURES 40 MSPS Correlated Double Sampler (CDS) 6 d B to 40 d B 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:160 m W @ 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 plete 12-Bit 40 MHz CCD Signal Processor GENERAL DESCRIPTION The AD9945 is a plete 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 controlled 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, typically dissipates160 m W, and is packaged in a space-saving 32-lead LFCSP. FUNCTIONAL BLOCK DIAGRAM REFT REFB PBLK CCDIN 6d B TO 40d B VGA BAND GAP REFERENCE 12-BIT ADC DRVDD DRVSS 12 DOUT AVDD AVSS CONTROL REGISTERS DIGITAL INTERFACE CLPOB INTERNAL TIMING DVDD DVSS SL SCK SDATA SHP SHD DATACLK REV. C 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,...