Analog Devices Inc. AD9822JRRL

Overview

AD9822JRRL from Analog Devices is a complete 14-bit CCD/CIS analog signal processor with integrated 3-channel CDS, programmable gain amplifiers (1–5.7×), ±350 mV offset adjustment, and multiplexed 8+6-bit digital output. It operates at up to 15 MSPS in 3-channel CDS mode and supports flatbed scanners, film scanners, and digital copiers requiring high-fidelity trilinear color signal conditioning.

For engineers reviewing the AD9822JRRL datasheet, AD9822JRRL pinout, AD9822JRRL application, or AD9822JRRL equivalent, this page delivers verified functional architecture, real-world timing constraints (e.g., tC2ADF = 30–40 ns), channel crosstalk (<1 LSB), and register-level configuration details for CCD sensor interface design and system integration.

Technical Context

The AD9822JRRL implements a fully synchronous 3-channel analog front-end with independent CDS/SHA selection per channel via configuration register bit D4, and channel sequencing controlled by the MUX register. Its correlated double sampling uses two dedicated clocks (CDSCLK1 and CDSCLK2) with aperture delay of 2 ns and strict inter-clock timing (tC2ADF, tC2C1).

It integrates three matched PGAs (64-step gain control, monotonic), three 9-bit offset DACs (512-step resolution, sign-magnitude coding), and a shared 14-bit ADC with fixed 3-cycle pipeline latency. Digital I/O supports 3–5 V logic levels, and internal bandgap reference enables 2 V or 4 V full-scale ADC range selection.

Key Specifications

Pinout & Package

AD9822JRRL is packaged in a 28-lead SOIC (300 mil) with standard JEDEC outline and θ_JA = 71.4°C/W thermal resistance. Pin functions are validated per Analog Devices Rev. B datasheet Figure 2 and Table 5.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CCD/CIS signal processor applications.

Compared with AD9822JRRL, AD9826ASTZ offers higher resolution but sacrifices configurability and integrated reference, while TDC1308IPWPR simplifies system timing at the expense of analog processing depth and color channel independence.

Availability

AD9822JRRL is available at Aetrix Electronics and suitable for flatbed document scanners, film scanners, and digital color copiers requiring stable component supply, long-term obsolescence management, and traceable sourcing for industrial imaging systems.

Supply support for AD9822JRRL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide and ISO 9001-certified manufacturing.

The AD9822JRRL belongs to Analog Devices' Imaging Signal Processor product line, engineered specifically for high-fidelity CCD and CIS sensor interfacing in professional and industrial scanning equipment.

FAQ

What is the maximum pixel rate supported by AD9822JRRL in 3-channel CDS mode?

The AD9822JRRL supports a maximum pixel rate of 15 MSPS in 3-channel CDS mode, corresponding to a minimum pixel period of 67 ns (tPRA). This enables real-time digitization of high-speed trilinear CCD arrays used in professional film and document scanners. The timing constraint is enforced by internal clock domain synchronization between CDSCLK2 and ADCCLK, with tC2ADF specified at 30–40 ns.

Does AD9822JRRL support both CCD and CIS sensors?

Yes, AD9822JRRL supports both CCD and CIS sensors through configurable operation modes. In CDS mode (bit D4 = 1), it performs correlated double sampling ideal for CCDs with reset noise. In SHA mode (bit D4 = 0), it acts as a sample-and-hold amplifier suitable for contact image sensors and CMOS active pixel sensors that do not require CDS. The input clamp is automatically disabled in SHA mode.

How is the 14-bit output formatted on the AD9822JRRL data bus?

The AD9822JRRL outputs its 14-bit result in multiplexed 8-bit format: the MSB byte (DB13–DB6) appears first on D7–D0, followed by the LSB byte (DB5–DB0) on the same pins during the next cycle. This 8+6 structure reduces pin count while maintaining full resolution. Output enable is controlled by the active-low OEB pin, and data valid timing is defined by tOD = 8 ns after ADCCLK falling edge.

Can AD9822JRRL operate with a 3.3 V digital supply?

No, AD9822JRRL requires DRVDD = 5 V ± 0.25 V for digital I/O operation, as specified in the Absolute Maximum Ratings and Digital Specifications tables. While digital logic thresholds (VIH = 2.0 V, VIL = 0.8 V) are compatible with 3.3 V signaling, the DRVDD supply must be 5 V to ensure proper output drive strength (VOH ≥ 4.5 V, VOL ≤ 0.1 V) and meet timing specifications such as tOD and tDV.

What is the function of the OFFSET pin on AD9822JRRL?

The OFFSET pin on AD9822JRRL serves as a coarse DC bias reference for the analog input stage. In SHA mode, it sets the sampling reference level - grounding OFFSET yields zero-scale ADC output for 0 V input. In CDS mode, it biases the clamp circuit. A voltage applied to OFFSET is subtracted from all three channel inputs (VINR/VING/VINB) in the first amplifier stage, enabling global offset correction without modifying individual channel DAC settings.