Analog Devices Inc. AD9822JRSZ

Overview

AD9822JRSZ from Analog Devices is a complete 14-bit CCD/CIS analog signal processor with 3-channel correlated double sampling (CDS), 1–6× programmable gain, ±350 mV offset adjustment, and multiplexed 8+6-bit digital output. It processes trilinear color CCD outputs in flatbed scanners and film scanners at up to 15 MSPS in 3-channel CDS mode.

For engineers reviewing the AD9822JRSZ datasheet, AD9822JRSZ pinout, AD9822JRSZ application, or AD9822JRSZ equivalent, this page delivers verified technical context, real-world timing behavior, channel-specific gain/offset programming, power-down mode operation (<1 mW), and SOIC-28 package integration guidance for imaging signal chain design.

Technical Context

The AD9822JRSZ implements a fully integrated 3-channel analog front-end with independent CDS amplifiers, programmable gain amplifiers (PGA), and offset DACs per channel-each feeding a shared 14-bit ADC via time-multiplexed sampling. Its dual-clock CDS architecture (CDSCLK1 for reference level, CDSCLK2 for data level) enables precise noise rejection in CCD readout paths.

It supports four operational modes-3-channel CDS, 3-channel SHA, 1-channel CDS, and 1-channel SHA-selected via serial interface configuration register. The 3-wire serial interface (SCLK/SLOAD/SDATA) programs gain (64 steps), offset (512 steps), MUX order, clamp bias, and power-down state without external logic.

Key Specifications

Pinout & Package

AD9822JRSZ is packaged in a 28-lead SOIC (300 mil) with exposed pad thermal performance (θ_JA = 71.4°C/W). 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 processing applications.

Compared with AD9822JRSZ, AD9826JRSZ trades speed and power for resolution, while TDC1300IPWPR sacrifices channel count and flexibility for footprint and interface simplicity-making AD9822JRSZ optimal for balanced RGB scanner performance.

Availability

AD9822JRSZ is available at Aetrix Electronics and suitable for flatbed document scanners, film scanners, and digital color copiers requiring stable component supply, long-term manufacturability, and consistent electrical performance across production batches.

Supply support for AD9822JRSZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, and consumer markets since 1965.

The AD9822JRSZ belongs to Analog Devices' Imaging Signal Processor product line, designed specifically for CCD and CIS-based optical scanning systems requiring integrated CDS, gain, offset, and ADC functionality in a single IC.

FAQ

What is the maximum pixel rate supported by AD9822JRSZ in 3-channel CDS mode?

The AD9822JRSZ supports a maximum pixel rate of 15 MSPS in 3-channel CDS mode, corresponding to 5 MSPS per RGB channel. This is confirmed in Table 1 of the Rev. B datasheet under "Maximum Conversion Rate." The timing constraint tPRA = 67 ns defines the minimum pixel period, directly enabling high-speed flatbed and film scanner operation without external buffering.

Does AD9822JRSZ require an external voltage reference?

No, AD9822JRSZ includes an internal bandgap voltage reference (1.0 V ±6% differential between CAPT and CAPB), which is enabled by default via bit D6 in the Configuration Register. An external reference may be used only if D6 is set low-confirmed in Table 7 and Functional Description section. The internal reference eliminates BOM cost and layout area for most scanner applications.

How is channel selection configured on AD9822JRSZ?

Channel selection on AD9822JRSZ is controlled by the MUX Register (address 0x01). In 3-channel mode, bit D7 sets RGB (high) or BGR (low) sequencing order; in 1-channel mode, bits D6–D4 individually enable red, green, or blue. All settings are written via the 3-wire serial interface-no hardware jumpers or strapping pins are needed, as documented in Table 8 and Figure 3 timing diagrams.

What is the function of the OFFSET pin on AD9822JRSZ?

The OFFSET pin on AD9822JRSZ serves as a coarse DC bias input for the first-stage amplifier. When grounded, it sets 0 V input to correspond to ADC zero-scale output. A voltage applied to OFFSET is subtracted from all three analog inputs (VINR/VING/VINB), enabling system-level black-level calibration. This function is active in SHA mode and disabled in CDS mode per the Functional Description section.

Can AD9822JRSZ operate with a 3.3 V digital supply?

Yes, AD9822JRSZ supports 3 V to 5.25 V on the DRVDD rail, enabling direct interface with 3.3 V FPGAs or microcontrollers. Digital I/O levels (VIH = 2.0 V min, VOL = 0.1 V max) and 3-wire serial interface are fully compatible-verified in Table 2 (Digital Specifications) and General Description. AVDD must remain at 5 V ±5% for analog performance compliance.