AD9945KCPZ

FEATURES

-40 MSPS Correlated Double Sampler (CDS)

-6 dB to 40 dB 10-Bit Variable Gain Amplifier (VGA)

-Low Noise Optical Black Clamp Circuit

-Preblanking Function

-12-Bit 40 MSPS A/D Converter

-No Missing Codes Guaranteed

-3-Wire Serial Digital Interface

-3 V Single-Supply Operation

-Low Power: 140 mW @ 3 V Supply

-Space-Saving 32-Lead 5 mm
5 mm LFCSP

APPLICATIONS

-Digital Still Cameras

-Digital Video Camcorders

-PC Cameras

-Portable CCD Imaging Devices

-CCTV Cameras

GENERAL DESCRIPTION

The AD9945 is a complete analog signal processor for CCD applications. It features a 40 MHz single-channel architecture designed to sample and condition the outputs of interlaced and progressive scan area CCD arrays. The AD9945’s signal chain consists of a correlated double sampler (CDS), a digitally controlled variable gain amplifier (VGA), a black level clamp, and a 12-bit A/D converter.

The internal registers are programmed through a 3-wire serial digital interface. Programmable features include gain adjustment, black level adjustment, input clock polarity, and power-down modes. The AD9945 operates from a single 3 V power supply, typically dissipates 140 mW, and is packaged in a space-saving 32-lead LFCSP.

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