AD9823

Correlated Double Sampler (CDS) AD9823 FEATURES 40 MHz correlated double sampler (CDS) Fixed 3.5 dB CDS gain Low noise optical black clamp circuit 3 V single-supply operation 14-lead TSSOP package FUNCTIONAL BLOCK DIAGRAM AD9823 3.5dB FIXED GAIN OUTPUT BUFFER CCDIN CDS OUTPUT APPLICATIONS Digital still cameras Digital video camcorders CCTV cameras PC cameras Portable CCD imaging devices BYP2 CLP CLP OUTPUT BUFFER REFOUT INTERNAL TIMING INTERNAL REFERENCE VDD GND 04538-0-001 SHP SHD BYP1 BYP3 Figure 1. Functional Block Diagram PRODUCT DESCRIPTION The AD9823 is a correlated double sampler for digital camera applications. It features a 40 MHz CDS amplifier with 3.5 dB of fixed gain, an internal voltage reference supply, and timing control for the SHP and SHD sampling clocks. Output buffers are also included, providing drive strength for PCB traces and direct connection to an image signal processor such as the AD9821. The AD9823 is ideal for applications that need to place the CDS and VGA/ADC circuits on separate PC boards. The “pseudo differential” outputs of the AD9823 provide good signal integrity when interfaced with the differential input AD9821. The AD9823 operates from a single 3 V power supply, typically dissipates 50 mW, and is packaged in a 14-lead TSSOP package. 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 patent...