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