AD9804AJSTRL

Overview

The AD9804AJSTRL is a complete analog signal processor for CCD applications, featuring an 18 MHz single-channel architecture. It conditions outputs from interlaced and progressive scan area CCD arrays through a signal chain comprising an input clamp, correlated double sampler (CDS), digitally controlled VGA, black level clamp, and a 10-bit A/D converter. The device operates on a 3 V single supply with low power consumption of 85 mW. Key specifications include a maximum clock rate of 18 MHz, a VGA gain range of 6 dB to 40 dB with 10-bit resolution, and a 3-wire serial digital interface for register programming. It is housed in a 48-lead LQFP package.

Feature Summary

• Integrates a 10-bit, 18 MSPS ADC with a digitally controlled variable gain amplifier offering a 6 dB to 40 dB gain range.
• Includes dedicated circuitry for correlated double sampling (CDS) and black level clamping to restore DC levels and reduce noise.
• Features a 3-wire serial digital interface for programmable control of internal registers, including VGA gain settings.
• Designed for low power operation using a single 3 V supply and CMOS technology.

Applications

• PC Cameras
• Digital Still Cameras

Procurement Notes

Verify the component status before procurement as the datasheet indicates this part is obsolete. Confirm availability through authorized distributors or secondary market suppliers. Ensure the ordering suffix matches the required package type and temperature range. Check for RoHS compliance and lead-free status if applicable to your manufacturing process. Validate that the specific revision of the component meets your system requirements.

Selection Notes

Select the AD9804 for applications requiring direct interfacing with CCD sensors in imaging systems. Consider its 10-bit resolution and 18 MHz sampling rate for suitable image quality and speed. Evaluate the need for integrated CDS and clamping functions to simplify board design. Compare against newer ADI CCD processors if higher performance or active support is required. Ensure compatibility with the system's timing generator and digital processing ASIC.

Part Context

The AD9804 is part of Analog Devices' family of CCD signal processors, designed to bridge analog CCD outputs with digital image processing units. It simplifies system design by integrating essential front-end functions into a single chip. This component targets cost-sensitive imaging applications where moderate resolution and speed are sufficient. It represents an earlier generation of integrated CCD drivers compared to current high-performance alternatives.

Replacement Considerations

The datasheet lists the AD9806 as a similar component. Verify pinout and functional compatibility before substitution. Consider newer ADI CCD processors for improved performance and active support. Check for availability of alternative packages or updated revisions.