Analog Devices Inc. AD9841AJSTZRL

Overview

AD9841AJSTZRL from Analog Devices is a complete 20 MSPS CCD signal processor IC featuring a 10-bit ADC, 200 mV optical black pixel amplitude support, 2 dB–36 dB VGA gain range, and 48-lead LQFP package. It performs correlated double sampling (CDS), pixel-level gain adjustment (PxGA®), black level clamping, and analog-to-digital conversion for interlaced/progressive scan CCD arrays in digital still cameras.

For engineers reviewing the AD9841AJSTZRL datasheet, AD9841AJSTZRL pinout, AD9841AJSTZRL application, or AD9841AJSTZRL equivalent, key selection criteria include its 10-bit resolution, 20 MHz maximum clock rate, single 3 V supply operation, low 78 mW power consumption, and support for CCD-specific timing modes including CLPOB/CLPDM clamping and PxGA color steering.

Technical Context

The AD9841AJSTZRL implements a fully integrated analog signal chain optimized for CCD output conditioning: input clamp removes optical black offset before amplification to minimize gain-step-induced black level drift; CDS uses SHP/SHD rising edges with 3 ns internal delay to reject reset kTC noise; PxGA provides 64-step programmable per-pixel gain across four user-selectable color steering modes (e.g., Mosaic Separate, Interlace).

Its VGA offers 1024-step 2 dB–36 dB gain control with monotonicity guaranteed, while the 10-bit ADC delivers ±0.4 LSB typical DNL and no missing codes over full temperature range (–20°C to +85°C). The device supports three operational modes-CCD, AUX1, and AUX2-with distinct input paths, clamp configurations, and VGA resolution (1024/1023/512 steps respectively).

Key Specifications

Pinout & Package

AD9841AJSTZRL is housed in a 48-lead LQFP (ST-48) package with exposed pad thermal enhancement (θ_JA = 92°C/W). Pin functions are electrically isolated per domain: analog inputs (CCDIN, AUX1IN, AUX2IN), digital clocks (DATACLK, SHP, SHD, CLPOB), serial interface (SCK, SDATA, SL), and power rails (AVDD1/AVDD2, DVDD1/DVDD2, DRVDD).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar CCD signal processing applications.

Compared with AD9842AJSTZRL, the AD9841AJSTZRL trades 2-bit resolution for lower cost and reduced data throughput; versus TDC1304D, it delivers a complete CCD-optimized signal chain with hardware-accelerated timing and color processing-eliminating FPGA-based logic for PxGA sequencing and CDS alignment.

Availability

AD9841AJSTZRL is available at Aetrix Electronics and suitable for digital still cameras, digital video camcorders, and CCD-based industrial inspection systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD9841AJSTZRL 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.

The AD9841A product line was designed specifically for CCD-based imaging systems-integrating CDS, PxGA®, VGA, clamping, and ADC into a single 3 V, low-power IC to replace multi-chip analog front-end solutions in portable and embedded cameras.

FAQ

What is the ADC resolution of the AD9841AJSTZRL?

The AD9841AJSTZRL features a true 10-bit analog-to-digital converter with guaranteed no missing codes and ±0.4 LSB typical differential nonlinearity. Its full-scale input voltage is 2.0 V, and output coding is straight binary-enabling direct interface with downstream digital image processors without format conversion. This resolution is confirmed in the "A/D CONVERTER (AD9841A)" section of the official datasheet.

Does the AD9841AJSTZRL support CCD-specific timing modes like CLPOB and CLPDM?

Yes, the AD9841AJSTZRL natively supports CCD-specific clamping timing: CLPOB (black level clamp clock) and CLPDM (input clamp clock) are dedicated digital inputs (pins 20 and 23) with defined pulse width requirements (minimum 2 and 4 pixels respectively). These signals synchronize clamping to optical black pixels and dummy pixel regions-ensuring accurate DC restoration without disrupting active pixel data, as detailed in Figures 5–6 and Table I of the datasheet.

How does the PxGA® function work in the AD9841AJSTZRL?

The PxGA® (Pixel Gain Amplifier) in the AD9841AJSTZRL provides four independently programmable gain values (GAIN0–GAIN3) applied on a pixel-by-pixel basis using color steering logic. It supports seven modes-including Mosaic Separate (Bayer), Interlace, and 4-Color-to match common CCD color filter arrays. Gains range from –2 dB to +10 dB in 64 steps, and are updated synchronously with SHP rising edges, as specified in Figures 8–20 and Table VII of the datasheet.

What power supply requirements does the AD9841AJSTZRL have?

The AD9841AJSTZRL operates from a single 3.0 V supply with allowable range 2.7 V to 3.6 V across AVDD, DVDD, and DRVDD rails. Total power consumption is 78 mW under normal operation at 3.0 V and 20 MSPS, with low-power modes reducing dissipation to 30 mW (fast recovery), 5 mW (standby), or 1 mW (total shutdown). Power rail separation (AVSS/DVSS/DRVSS) is mandatory for optimal noise performance.

Is the AD9841AJSTZRL pin-compatible with other devices in the AD984x family?

Yes, the AD9841AJSTZRL shares identical 48-lead LQFP (ST-48) packaging and pinout with AD9842AJSTZRL-including all power, ground, clock, data, and control signals. Functional differences (e.g., 10-bit vs. 12-bit ADC, clamp range) are implemented internally; no PCB layout changes are required when migrating between these variants, as confirmed in the Ordering Guide and Pin Function Descriptions sections of the datasheet.