GENERAL DESCRIPTION

The AD9943/AD9944 are complete analog signal processors for CCD applications. They feature a 25 MHz single-channel architecture designed to sample and condition the outputs of interlaced and progressive scan area CCD arrays. The signal chain for the AD9943/AD9944 consists of a correlated double sampler (CDS), a digitally controlled variable gain amplifier (VGA), and a black level clamp. The AD9943 offers 10-bit ADC resolution, while the AD9944 contains a true 12-bit ADC.

FEATURES

25 MSPS correlated double sampler (CDS)

6 dB to 40 dB 10-bit variable gain amplifier (VGA)

Low noise optical black clamp circuit

Preblanking function

10-bit (AD9943), 12-bit (AD9944) 25 MSPS A/D converter

No missing codes guaranteed

3-wire serial digital interface

3 V single-supply operation

Space-saving 32-lead 5 mm × 5 mm LFCSP package

APPLICATIONS

Digital still cameras

Digital video camcorders

PC cameras

Portable CCD imaging devices

CCTV cameras