GENERAL DESCRIPTION
The AD9821 is a complete analog signal processor for imaging applications that do not require Correlated Double Sampling (CDS). It features a 40 MHz single-channel architecture designed to sample and condition the outputs of CMOS imagers and CCD arrays already containing on-chip CDS. The AD9821’s signal chain consists of a differential input sample-and-hold amplifier (SHA), digitally controlled variable gain amplifier (VGA), black level clamp, and a 12-bit ADC.

FEATURES
   Differential Sensor Input with 1 V p-p Input Range
   0 dB to 36 dB 10-Bit Variable Gain Amplifier (VGA)
   Low Noise Optical Black Clamp Circuit
   Analog Preblanking Function
   12-Bit 40 MSPS A/D Converter (ADC)
   3-Wire Serial Digital Interface
   3 V Single-Supply Operation
   Low Power: 150 mW @ 3 V Supply
   48-Lead LQFP Package

APPLICATIONS
   Digital Still Cameras Using CMOS Imagers
   Industrial/Scientific Imaging