AD9826 Signal Processor: Pinout, Features and Datasheet

The AD9826 is a complete analog signal processor for imaging applications. It features a 3-channel architecture designed to sample and condition the outputs of trilinear color CCD arrays. Each channel consists of an input clamp, Correlated Double Sampler (CDS), offset DAC, and Programmable Gain Amplifier (PGA), multiplexed to a high-performance 16-bit A/D converter.

This article provides you with a basic overview of the AD9826, including its pin descriptions, features and specifications, etc., to help you quickly understand what AD9826 is.

● 16-Bit 15 MSPS A/D Converter

● 3-Channel 16-Bit Operation up to 15 MSPS

● 1-Channel 16-Bit Operation up to 12.5 MSPS

● 2-Channel Mode for Mono Sensors with Odd/Even Outputs Correlated Double Sampling

● 1~6× Programmable Gain

● ±300 mV Programmable Offset

● Input Clamp Circuitry

● Internal Voltage Reference

● Multiplexed Byte-Wide Output

● Optional Single Byte Output Mode

● 3-Wire Serial Digital Interface

● 3 V/5 V Digital I/O Compatibility

● 28-Lead SSOP Package

● Low Power CMOS: 400 mW (Typ)

● Power-Down Mode Available

The AD9826 can operate at speeds greater than 15 MSPS with reduced performance. The CDS amplifiers may be disabled for use with sensors that do not require CDS, such as Contact Image Sensors (CIS), CMOS active pixel sensors, and Focal Plane Arrays. The 16-bit digital output is multiplexed into an 8-bit output word, which is accessed using two read cycles. There is an optional single byte output mode. The internal registers are programmed through a 3-wire serial interface, and provide adjustment of the gain, offset, and operating mode.

The AD9826 operates from a single 5 V power supply, typically consumes 400 mW of power, and is packaged in a 28-lead SSOP. The AD9826 can be operated in six different modes: 3-Channel CDS Mode, 3-Channel SHA Mode, 2-Channel CDS Mode, 2-Channel SHA Mode, 1-Channel CDS Mode, and 1-Channel SHA Mode. Each mode is selected by programming the Configuration Registers through the serial interface.

Functional Block Diagram

1-Channel CDS Mode Timing

1-Channel SHA Mode Timing

2-Channel CDS Mode Timing

2-Channel SHA Mode Timing

3-Channel CDS Mode Timing

3-Channel SHA Mode Timing

● Flatbed Document Scanners

● Digital Copier

● Multifunction Peripherals

● Infrared Imaging Applications

● Machine Vision

28-Lead Shrink Small Outline Package [SSOP]

Analog Devices is an international market leader in the design, production, and commercialization of a large range of high-performance integrated circuits (ICs) for analog, mixed-signal, and digital signals (DSP) processing of almost all electronic systems. Since we started in 1965, the focus has been on the engineering challenge in electronic equipment related to signal to process. Our signal processing solutions, utilized by over 100,000 customers worldwide, play a key role in the conversion, conditioning, and processing of real-world events such as temperature, pressure, sonority, illumination, speed, and movement to electric signals for a wide range of electronic devices.