Complete 12-Bit 40 MHz CCD Signal Processor AD9945 FEATURES GENERAL DESCRIPTION 40 MSPS Correlated Double Sampler (CDS) The AD9945 is a complete analog signal processor for CCD 6 dB to 40 dB 10-Bit Variable Gain Amplifier (VGA) applications. It features a 40 MHz single-channel architecture Low Noise Optical Black Clamp Circuit designed to sample and condition the outputs of interlaced and Preblanking Function progressive scan area CCD arrays. The AD9945s signal chain 12-Bit 40 MSPS A/D Converter consists of a correlated double sampler (CDS), a digitally con- No Missing Codes Guaranteed trolled variable gain amplifier (VGA), a black level clamp, and a 3-Wire Serial Digital Interface 12-bit A/D converter. 3 V Single-Supply Operation The internal registers are programmed through a 3-wire serial digital Low Power: 160 mW 3 V Supply interface. Programmable features include gain adjustment, black Space-Saving 32-Lead 5 mm 5 mm LFCSP level adjustment, input clock polarity, and power-down modes. APPLICATIONS The AD9945 operates from a single 3 V power supply, typi- Digital Still Cameras cally dissipates 160 mW, and is packaged in a space-saving Digital Video Camcorders 32-lead LFCSP. PC Cameras Portable CCD Imaging Devices CCTV Cameras FUNCTIONAL BLOCK DIAGRAM REFT REFB PBLK AD9945 DRVDD BAND GAP REFERENCE DRVSS 6dB TO 40dB 12 12-BIT CDS VGA DOUT CCDIN ADC CLP 10 AVDD CLPOB AVSS CONTROL REGISTERS DVDD DIGITAL INTERNAL INTERFACE TIMING 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. may result from its use. No license is granted by implication or otherwise Tel: 781/329-4700 www.analog.com under any patent or patent rights of Analog Devices. Trademarks and 781/461-3113 2013 Analog Devices, Inc. All rights reserved. registered trademarks are the property of their respective owners. Fax: AD9945SPECIFICATIONS (T to T , AVDD = DVDD = DRVDD= 3.0 V, f = 40 MHz, unless otherwise noted.) GENERAL SPECIFICATIONS MIN MAX SAMP Parameter Min Typ Max Unit TEMPERATURE RANGE Operating 20 +85 C Storage 65 +150 C POWER SUPPLY VOLTAGE 2.85 Analog, Digital, Digital Driver 3.6 V POWER CONSUMPTION Normal Operation (DRVDD Power not Included) 160 mW DRVDD Power Only (C = 20 pF) 10 mW LOAD Power-Down Mode 1.5 mW MAXIMUM CLOCK RATE 40 MHz Specifications subject to change without notice. (DRVDD = DVDD = 2.85 V, C = 20 pF, unless otherwise noted.) L DIGITAL SPECIFICATIONS Parameter Symbol Min Typ Max Unit LOGIC INPUTS High Level Input Voltage V 2.1 V IH Low Level Input Voltage V 0.6 V IL High Level Input Current I 10 A IH Low Level Input Current I 10 A IL Input Capacitance C 10 pF IN LOGIC OUTPUTS High Level Output Voltage, I = 2 mA V 2.2 V OH OH Low Level Output Voltage, I = 2 mA V 0.5 V OL OL Specifications subject to change without notice. 2 REV. C