AD9945KCP

Overview

The AD9945KCP is a complete analog signal processor for CCD applications, featuring a 40 MHz single-channel architecture designed to sample and condition outputs of interlaced and progressive scan area CCD arrays. The 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. It operates from a single 3 V power supply with typical power consumption of 160 mW. The device utilizes a 3-wire serial digital interface for programming internal registers, allowing adjustments to gain, black level, input clock polarity, and power-down modes.

Feature Summary

• Integrated 40 MSPS Correlated Double Sampler (CDS) for noise rejection
• Digitally controlled Variable Gain Amplifier (VGA) with 10-bit resolution
• Low Noise Optical Black Clamp Circuit for black level correction
• 12-Bit 40 MSPS A/D Converter with guaranteed no missing codes

Applications

• Digital Still Cameras
• Digital Video Camcorders
• PC Cameras
• Portable CCD Imaging Devices
• CCTV Cameras

Procurement Notes

Verify the specific ordering suffix when sourcing components, as variants such as KCPZ or KCPZRL7 may exist with identical electrical specifications but different packaging formats like tape and reel versus tray. Confirm RoHS compliance status and ensure the supplier provides valid datasheets matching the exact part number to avoid discrepancies in package dimensions or pinout configurations during procurement.

Selection Notes

Select this component for designs requiring a single-chip solution for CCD signal conditioning up to 40 MHz. Ensure the system timing generator can provide the necessary SHP, SHD, and DATACLK signals. Verify that the microprocessor or ASIC supports the 3-wire serial interface protocol for register configuration. Consider the 32-lead LFCSP package constraints for PCB layout and thermal management requirements.

Part Context

The AD9945 belongs to Analog Devices' family of CCD signal processors, serving as an analog front-end (AFE) for image sensors. It integrates functions typically handled by multiple discrete components, including CDS, VGA, and ADC. This integration reduces board space and simplifies design complexity for portable imaging devices compared to earlier multi-chip solutions.

Replacement Considerations

Public confirmed substitute part numbers include AD9945KCPZ and AD9945KCPZRL7.