Correlated Double Sampler (CDS) AD9823 FEATURES FUNCTIONAL BLOCK DIAGRAM 40 MHz correlated double sampler (CDS) AD9823 Fixed 3.5 dB CDS gain Low noise optical black clamp circuit 3.5dB FIXED GAIN 3 V single-supply operation OUTPUT CCDIN CDS OUTPUT 14-lead TSSOP package BUFFER APPLICATIONS BYP2 CLP Digital still cameras Digital video camcorders CLP OUTPUT CCTV cameras REFOUT BUFFER PC cameras Portable CCD imaging devices VDD INTERNAL INTERNAL REFERENCE TIMING GND BYP1 BYP3 SHP SHD Figure 1. Functional Block Diagram PRODUCT DESCRIPTION The AD9823 is a correlated double sampler for digital camera The AD9823 is ideal for applications that need to place the CDS applications. It features a 40 MHz CDS amplifier with 3.5 dB of and VGA/ADC circuits on separate PC boards. The pseudo fixed gain, an internal voltage reference supply, and timing differential outputs of the AD9823 provide good signal control for the SHP and SHD sampling clocks. Output buffers integrity when interfaced with the differential input AD9821. are also included, providing drive strength for PCB traces and The AD9823 operates from a single 3 V power supply, typically direct connection to an image signal processor such as the dissipates 50 mW, and is packaged in a 14-lead TSSOP package. AD9821. 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 that may result from its use. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Specifications subject to change without notice. No license is granted by implication Tel: 781.329.4700 www.analog.com or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Fax: 781.326.8703 2003 Analog Devices, Inc. All rights reserved. 04538-0-001AD9823 TABLE OF CONTENTS Specifications..................................................................................... 3 Thermal Characteristics ...............................................................5 General Specifications ................................................................. 3 ESD Caution...................................................................................5 Analog Specifications................................................................... 3 Pin Configuration and Function Descriptions..............................6 Digital Specifications ................................................................... 3 SHP and SHD Timing ..................................................................6 Timing Specifications .................................................................. 4 Outline Dimensions ..........................................................................8 Absolute Maximum Ratings............................................................ 5 Ordering Guide .............................................................................8 REVISION HISTORY Revision 0: Initial Version Rev. 0 Page 2 of 8