Complete 10-Bit and 12-Bit, 25 MHz CCD Signal Processors Data Sheet AD9943/AD9944 FEATURES GENERAL DESCRIPTION The AD9943/AD9944 are complete analog signal processors 25 MSPS correlated double sampler (CDS) for CCD applications. They feature a 25 MHz single-channel 6 dB to 40 dB 10-bit variable gain amplifier (VGA) Low noise optical black clamp circuit architecture designed to sample and condition the outputs of Preblanking function interlaced and progressive scan area CCD arrays. The signal 10-bit (AD9943), 12-bit (AD9944) 25 MSPS A/D converter chain for the AD9943/AD9944 consists of a correlated double No missing codes guaranteed sampler (CDS), a digitally controlled variable gain amplifier 3-wire serial digital interface (VGA), and a black level clamp. The AD9943 offers 10-bit 3 V single-supply operation ADC resolution, while the AD9944 contains a true 12-bit ADC. Space-saving 32-lead 5 mm 5 mm LFCSP package The internal registers are programmed through a 3-wire serial digital interface. Programmable features include gain APPLICATIONS adjustment, black level adjustment, input clock polarity, and Digital still cameras power-down modes. The AD9943/AD9944 operate from a Digital video camcorders single 3 V power supply, typically dissipate 79 mW, and are PC cameras packaged in space-saving 32-lead LFCSP packages. Portable CCD imaging devices CCTV cameras FUNCTIONAL BLOCK DIAGRAM REFT REFB PBLK AD9943/AD9944 DRVDD BAND GAP REFERENCE DRVSS 6dB40dB 10/12 10-/12-BIT CCDIN DOUT CDS VGA ADC CLP 10 AVDD CLPOB AVSS CONTROL REGISTERS DVDD DIGITAL INTERNAL INTERFACE TIMING DVSS SL SCK SDATA SHP SHD DATACLK Figure 1. Functional Block Diagram Rev. C Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20042014 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 02905-B-001AD9943/AD9944 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Equivalent Input Circuits .............................................................. 10 Applications ....................................................................................... 1 Typical Performance Characteristics ........................................... 11 General Description ......................................................................... 1 Internal Register Map .................................................................... 12 Functional Block Diagram .............................................................. 1 Serial Interface ................................................................................ 13 Revision History ............................................................................... 2 Circuit Description and Operation .............................................. 14 Specifications ..................................................................................... 3 DC Restore .................................................................................. 14 General Specifications ................................................................. 3 Correlated Double Sampler ...................................................... 14 Digital Specifications ................................................................... 3 Optical Black Clamp .................................................................. 14 AD9943 System Specifications ................................................... 3 A/D Converter ............................................................................ 15 AD9944 System Specifications ................................................... 4 Variable Gain Amplifier ............................................................ 15 Timing Specifications .................................................................. 5 CCD Mode Timing ........................................................................ 16 Absolute Maximum Ratings ............................................................ 6 Applications Information .............................................................. 17 Thermal Resistance ...................................................................... 6 Internal Power-On Reset Circuitry .......................................... 18 ESD Caution .................................................................................. 6 Grounding and Decoupling Recommendations .................... 18 Pin Configuration and Function Descriptions ............................. 7 Outline Dimensions ....................................................................... 19 Terminology ...................................................................................... 9 Ordering Guide ............................................................................... 19 REVISION HISTORY 3/14Rev. B to Rev. C Added Exposed Pad Notation, Figure 2 and Table 6 ................... 7 Added Exposed Pad Notation, Figure 3 and Table 7 ................... 8 Changes to Figure 17 ...................................................................... 17 Changes to Figure 18 ...................................................................... 18 Updated Outline Dimensions ....................................................... 19 Changes to Ordering Guide .......................................................... 19 5/04Data Sheet Changed from Rev. A to Rev. B Updated Format .................................................................. Universal Updated Outline Dimensions ....................................................... 20 Changes to Ordering Guide .......................................................... 20 5/03Data Sheet changed from Rev. 0 to Rev. A Added AD9944 ................................................................... Universal Changes to Features Section............................................................ 1 Updated Ordering Guide ................................................................. 5 Replaced TPC 3 ................................................................................. 9 Added Figure 12.............................................................................. 15 Updated Outline Dimensions ....................................................... 16 Rev. C Page 2 of 20