AD9843AJSTRL

Overview

The AD9843AJSTRL is a complete analog signal processor for CCD applications, featuring a 20 MHz single-channel architecture. It integrates an input clamp, correlated double sampler (CDS), digitally controlled variable gain amplifier (VGA), black level clamp, and a 10-bit A/D converter. The device operates from a single 3 V supply, dissipating 78 mW in normal operation. Key specifications include a 20 MSPS maximum clock rate, 64-step CDS gain range (-2 dB to +10 dB), and 1024-step VGA gain range (2 dB to 36 dB). It utilizes a 3-wire serial interface for register programming and is housed in a 48-lead LQFP package.

Feature Summary

• Integrates a 20 MSPS correlated double sampler with programmable gain for noise rejection.
• Includes a 10-bit ADC with a 2 V full-scale input range and guaranteed no missing codes.
• Features a digitally controlled variable gain amplifier with 10-bit resolution for precise signal conditioning.
• Supports multiple input modes including CCD, AUX1, and AUX2 for versatile video signal processing.

Applications

• Digital still cameras
• Digital video camcorders
• PC cameras

Procurement Notes

Verify the ordering suffix 'RL' indicates reel packaging when sourcing components. Confirm the specific temperature range of -20°C to +85°C matches the application environment requirements. Ensure the 48-lead LQFP footprint aligns with the PCB layout design before finalizing procurement decisions.

Selection Notes

Select this component for applications requiring integrated CCD signal conditioning with minimal external passive components. Consider the 2 V ADC full-scale range for improved noise performance compared to 1 V systems. Evaluate the power consumption specifications against battery-operated constraints if applicable.

Part Context

The AD9843A serves as an Analog Front End (AFE) for CCD image sensors, replacing discrete solutions for DC restoration, CDS, and amplification. It simplifies system design by integrating these functions into a single chip, reducing board space and component count for digital imaging devices.

Replacement Considerations

Check for pin-compatible alternatives within the AD98xx series if supply chain constraints exist. Verify that any substitute maintains the 20 MSPS sampling rate and 10-bit resolution required for the target imaging application.