AD9822JRSRL

Overview

The AD9822JRSRL is a complete analog signal processor for CCD imaging applications, featuring a 3-channel architecture designed to sample and condition outputs of trilinear color CCD arrays. It integrates an input clamp, correlated double sampler (CDS), offset DAC, and programmable gain amplifier (PGA) multiplexed to a high-performance 14-bit ADC. The device operates from a single 5 V power supply with typical power consumption of 385 mW. It supports 3-channel operation up to 15 MSPS and 1-channel operation up to 12.5 MSPS. The digital output is multiplexed into an 8-bit word accessed via two read cycles, controlled through a 3-wire serial interface.

Feature Summary

• Integrates a 14-bit ADC with guaranteed no missing codes and 15 MSPS sampling rate in 3-channel mode.
• Includes per-channel correlated double sampling (CDS), programmable gain amplifiers (1–6×), and programmable offset adjustment (±350 mV).
• Features a 3-wire serial digital interface for configuring gain, offset, and operating modes.
• Supports both CDS and Sample-and-Hold (SHA) modes, allowing CDS amplifiers to be disabled for CIS or CMOS sensors.

Applications

• Flatbed document scanners
• Film scanners
• Digital color copiers
• Multifunction peripherals

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature range. Ensure compatibility with system voltage requirements, specifically the 5 V analog supply and 3 V/5 V digital I/O levels. Confirm that the serial interface timing constraints meet the microcontroller's capabilities before finalizing procurement.

Selection Notes

Select this component for applications requiring integrated signal conditioning for trilinear CCD sensors. Consider the 14-bit resolution and 15 MSPS speed for high-quality image capture. Evaluate the need for CDS functionality versus SHA mode depending on the sensor type. Ensure the PCB layout accommodates the 28-lead SSOP package dimensions and provides adequate decoupling for the analog and digital supplies.

Part Context

The AD9822 is part of Analog Devices' family of analog signal processors designed for CCD imaging. It serves as a direct replacement for previous generations of discrete signal conditioning circuits, integrating multiple functions into a single chip. The JRSRL suffix indicates a specific variant within the AD9822 product line, typically denoting the package style and reel packaging configuration.

Replacement Considerations

Direct pin-compatible replacements include other variants in the AD9822 series such as the AD9822JR or AD9822JRS, provided the package and electrical specifications match the design requirements. Verify functional equivalence regarding channel count, resolution, and interface compatibility when substituting.