AD9845AJST

Overview

The AD9845AJST is a complete analog signal processor for CCD applications, featuring a 30 MHz single-channel architecture designed to sample and condition outputs of interlaced and progressive scan area CCD arrays. It operates from a single 3 V power supply with typical power consumption of 140 mW. The device integrates an input clamp, correlated double sampler (CDS), Pixel Gain Amplifier (PxGA), digitally controlled variable gain amplifier (VGA), black level clamp, and a 12-bit A/D converter. It utilizes a 3-wire serial digital interface for programmable features including gain adjustment, black level adjustment, input configuration, and power-down modes.

Feature Summary

• Integrates a 30 MSPS Correlated Double Sampler (CDS) for noise reduction
• Includes a 6-Bit Pixel Gain Amplifier (PxGA) with 4 dB to 6 dB color steering capability
• Features a 10-Bit Variable Gain Amplifier (VGA) providing 2 dB to 36 dB gain range
• Supports auxiliary inputs with dedicated VGA and input clamp functions

Applications

• Digital Still Cameras
• Digital Video Camcorders
• Industrial Imaging

Procurement Notes

Verify component authenticity through authorized Analog Devices distributors or direct manufacturer channels. Confirm the specific ordering suffix matches the required temperature range and package variant. Request original datasheets and test reports to validate performance specifications against application requirements before integration.

Selection Notes

Select this component for systems requiring a single-channel CCD signal processing solution with integrated analog conditioning and digitization. Ensure the design supports the 3 V single-supply operation and accommodates the 48-lead LQFP package dimensions. Verify that the host controller can interface with the 3-wire serial protocol for register configuration and control.

Part Context

The AD9845A belongs to the AD984x family of CCD signal processors developed by Analog Devices. This series provides complete analog front-end solutions for imaging applications, combining signal conditioning with high-resolution analog-to-digital conversion in a compact form factor suitable for space-constrained electronic devices.

Replacement Considerations

The AD9845B is documented as an improved version of the AD9845A with pin compatibility.