AD9843JST

Overview

The AD9843JST is a complete analog signal processor designed for CCD applications, manufactured by Analog Devices Inc. It features a 20 MHz single-channel architecture optimized to sample and condition outputs from interlaced and progressive scan area CCD arrays. The internal signal chain integrates an input clamp, correlated double sampler (CDS), digitally controlled variable gain amplifier (VGA), black level clamp, and a 10-bit A/D converter. Operating from a single 3 V supply, the device typically dissipates 65 mW at 2.7 V. It is housed in a 48-lead LQFP package and supports a 3-wire serial digital interface for register programming.

Feature Summary

• 20 MSPS Correlated Double Sampler (CDS) with 4 dB ± 6 dB variable gain and 6-bit resolution
• 10-Bit Variable Gain Amplifier (VGA) providing 2 dB to 36 dB adjustable gain
• Integrated 10-bit, 20 MSPS Analog-to-Digital Converter (ADC)
• Low noise clamp circuits and analog preblanking function

Applications

• Digital Still Cameras
• Digital Video Camcorders
• PC Cameras

Part Context

The AD9843JST belongs to the AD984x family of CCD signal processors. It serves as a specialized solution for video imaging systems requiring precise signal conditioning of charge-coupled device outputs. The 'JST' suffix indicates the specific package type and temperature rating configuration within the Analog Devices product line.

Replacement Considerations

The AD9842A offers similar functionality but includes a 12-bit ADC instead of 10-bit. The AD9844A provides 12-bit resolution with a 20 MSPS rate. Designers should verify ADC resolution requirements and pin compatibility when substituting these components.