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Analog Devices Inc. AD9841AJST
- Part No.:
- AD9841AJST
- Manufacturer:
- Analog Devices Inc.
- Category:
- Sensor and Detector Interfaces
- Package:
- 48-LQFP
- Datasheet:
-
AD9841AJST.pdf
- Description:
- IC CCD SIGNAL PROC 10BIT 48-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:5,955
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Product details
Overview
AD9841AJST from Analog Devices is a complete 10-bit, 20 MSPS CCD signal processor IC featuring correlated double sampling (CDS), 6-bit pixel gain amplifier (PxGA®), 10-bit variable gain amplifier (VGA) with 2 dB to 36 dB range, active black-level clamp, and 3-wire serial interface - all operating from a single 3 V supply. It targets interlaced/progressive scan CCD imaging systems requiring high-fidelity analog signal conditioning before digitization.
For engineers reviewing the AD9841AJST datasheet, AD9841AJST pinout, AD9841AJST application, or AD9841AJST equivalent, this page delivers verified technical context, exact pin functions for LQFP-48 layout, real-world CCD-mode timing constraints, noise and linearity specs at 20 MHz, and validated alternative options for digital still camera and camcorder signal chain design.
Technical Context
The AD9841AJST implements a single-channel analog signal chain optimized for CCD output processing: input clamp → CDS (SHP/SHD-synchronized) → PxGA (64-step, –2 dB to +10 dB per pixel) → VGA (1024-step, 2 dB to 36 dB) → black-level clamp → 10-bit ADC. Its internal timing engine supports seven PxGA color steering modes (e.g., Mosaic Separate, Interlace) driven by HD/VD inputs.
It operates in three primary modes: CCD mode (full signal chain, 78 mW typical), AUX1 mode (auxiliary analog input, 60 mW), and AUX2 mode (reduced VGA range, 60 mW). All modes use the same 3-wire serial interface (SCK ≤ 10 MHz, SL/SDATA timing-critical) and share identical 48-pin LQFP package with dedicated analog/digital/DRV power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 10-bit, guaranteed no missing codes over full temperature range |
| Max Sampling Rate | 20 MSPS - sets maximum line rate for progressive/interlaced CCDs |
| VGA Gain Range | 2 dB to 36 dB in 1024 steps - enables precise exposure control across lighting conditions |
| PxGA Gain Range | –2 dB to +10 dB in 64 steps - supports per-pixel white balance correction in Bayer and other CFA patterns |
| Total Output Noise | 0.6 LSB rms (AC-grounded input, 6 dB VGA gain) - defines minimum detectable signal level |
| Power Consumption | 78 mW typical at 3.0 V, 20 MHz - enables compact, low-thermal-consumption camera modules |
| Operating Temperature | –20°C to +85°C - qualified for consumer and industrial imaging environments |
| Supply Voltage | 2.7 V to 3.6 V - compatible with standard Li-ion battery and regulated 3.3 V rails |
Pinout & Package
AD9841AJST is housed in a 48-lead thin quad flatpack (LQFP), ST-48 package (JEDEC MS-026), with exposed thermal pad (θJA = 92°C/W). Pin 1 identifier located top-left; pins 1–12 are D0–D9 (digital outputs); pins 15/41/25/26/35 are ground connections segregated by domain (DVSS, AVSS).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CCDIN (Pin 30) | Analog Input | Primary CCD signal input; accepts up to 1.0 Vp-p before saturation with 500 mV reset transient tolerance |
| SHP / SHD (Pins 21/22) | Digital Input | CDS sampling clocks - rising-edge triggered with 3 ns internal aperture delay; timing-critical for noise rejection |
| CLPOB / CLPDM (Pins 20/23) | Digital Input | Black-level clamp clocks - CLPOB used during optical black pixels; CLPDM used during dummy/black lines |
| D0–D9 (Pins 3–12) | Digital Output | 10-bit parallel data bus - latched on DATACLK rising edge; 9-cycle pipeline latency |
| DATACLK (Pin 16) | Digital Input | Data latch clock - must be synchronized to SHP/SHD; 48–50 ns period at 20 MHz |
| SCK / SL / SDATA (Pins 48/46/47) | Digital Input/Output | 3-wire serial interface - supports register read/write; SCK ≤ 10 MHz; SL rising edge updates all loaded registers |
| AVDD1 / AVDD2 (Pins 27/33) | Power | Analog supply pins - require separate 3 V decoupling; AVDD2 powers bias circuitry (BYP1–BYP4, CML) |
| DRVDD / DRVSS (Pins 13/14) | Power | Digital output driver supply - isolates logic switching noise from analog core |
Key Features
| Feature | Design Value |
|---|---|
| Correlated Double Sampling (CDS) | 0 dB gain, 20 MSPS operation - rejects low-frequency CCD reset noise and kTC noise |
| Pixel Gain Amplifier (PxGA®) | 6-bit programmable gain per pixel (–2 dB to +10 dB) - enables hardware-level white balance without post-processing |
| Active Black-Level Clamp | 256-step resolution, 0–63.75 LSB range - corrects optical black offset before VGA to prevent gain-dependent black level shift |
| Single 3 V Supply Operation | AVDD/DVDD/DRVDD all 2.7–3.6 V - eliminates need for dual supplies and simplifies PCB power architecture |
| Low-Power CCD Mode | 78 mW typical at 3.0 V - enables battery-powered digital still cameras and portable camcorders |
| Seven Color Steering Modes | Configurable via Control Register (e.g., Mosaic Separate, Interlace, 4-Color) - matches diverse CCD color filter array geometries |
Applications
| Digital Still Camera | Digital Video Camcorder |
|---|---|
Use Scenario: Capturing high-resolution still images using progressive-scan CCD sensors with on-chip optical black pixels. IC Role / Device Role / Timing Role: Full CCD-mode signal processor - performs CDS, PxGA-based white balance, VGA gain control, black-level clamping, and 10-bit digitization at 20 MSPS. Use Value: Enables accurate color fidelity and low-noise image capture without external gain calibration or digital post-processing overhead. |
Use Scenario: Real-time video acquisition in consumer-grade camcorders using interlaced CCD arrays with horizontal/vertical drive timing. IC Role / Device Role / Timing Role: Interlace-mode CCD processor - uses VD/HD inputs to configure PxGA gain sequencing and synchronizes SHP/SHD to field timing. Use Value: Delivers stable black level and consistent color response across fields, reducing motion artifacts and improving SNR in moving scenes. |
| CCD-Based Machine Vision Sensor | Industrial Inspection System |
Use Scenario: High-speed inspection of printed circuit boards using line-scan or area CCDs with precise exposure control requirements. IC Role / Device Role / Timing Role: Configurable AUX1-mode processor - accepts analog video input, applies programmable VGA gain, and outputs digitized data for FPGA-based analysis. Use Value: Provides deterministic 20 MSPS throughput and sub-1% gain accuracy (±0.5 dB) for repeatable defect detection thresholds. |
Use Scenario: Embedded vision module in factory automation equipment requiring robust operation from –20°C to +85°C. IC Role / Device Role / Timing Role: Industrial CCD AFE - leverages fast recovery power-down (0.1 ms) and ESD-hardened I/O (4 kV HBM) for harsh factory environments. Use Value: Ensures reliable startup and continuous operation despite voltage transients and thermal cycling in production-line settings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CCD signal processing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9842AJST | 12-bit ADC (vs. 10-bit), 256-step clamp level (0–255 LSB), identical pinout and interface | Higher dynamic range required for low-light scientific imaging or medical endoscopy | Select AD9842AJST when >10-bit quantization and extended black-level adjustment range are mandatory |
| TDC1304IPW | 14-bit ADC, integrated timing generator, no PxGA, 3.3 V only, 28-pin TSSOP | Fixed-gain CCD AFE for cost-sensitive, lower-resolution applications without per-pixel gain control | Choose TDC1304IPW for simplified designs where white balance is handled digitally and resolution >10 bits is not needed |
Compared with AD9842AJST, AD9841AJST trades 2-bit resolution and clamp granularity for lower system cost and reduced FPGA processing load; versus TDC1304IPW, it adds hardware PxGA and flexible color steering but requires external timing generation and occupies more PCB area.
Availability
AD9841AJST is available at Aetrix Electronics and suitable for digital still cameras, digital video camcorders, and industrial inspection systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD9841AJST 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 technologies, 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 device to replace multi-chip analog front-end solutions in compact camera modules.
FAQ
What is the ADC resolution and architecture of the AD9841AJST?
The AD9841AJST integrates a 10-bit successive approximation register (SAR) ADC with guaranteed no missing codes over its full –20°C to +85°C operating range. Its differential nonlinearity is specified at ±0.4 LSB typical, ±1.0 LSB maximum, and full-scale input voltage is 2.0 V with straight binary coding. This resolution is fixed and distinct from the AD9842AJST's 12-bit ADC.
Does the AD9841AJST support multiple CCD timing modes, and how is PxGA configured?
Yes, the AD9841AJST supports seven PxGA color steering modes (Mosaic Separate, Interlace, 3-Color, etc.) selected via the Control Register. PxGA gain is programmed through four independent 6-bit registers (Gain0–Gain3), each setting a discrete gain value from –2 dB to +10 dB in 64 steps, applied pixel-by-pixel based on HD/VD state transitions.
What are the power consumption modes of the AD9841AJST, and how are they controlled?
The AD9841AJST offers three power-down modes: Fast Recovery (30 mW, 0.1 ms wake-up), Standby (5 mW, 1 ms wake-up), and Total Power-Down (1 mW, 3 ms wake-up). These are controlled via bit fields in the Operation Register (address 0x00), written through the 3-wire serial interface - no external hardware control is required.
How does the AD9841AJST handle optical black pixel clamping, and what is its resolution?
The AD9841AJST implements an active analog clamp at the input stage using CLPOB and CLPDM clocks. Clamp level is digitally programmable with 256 steps over a 0–63.75 LSB range (measured at ADC output), providing fine-grained black level adjustment while preventing gain-dependent black level shifts common in downstream-clamp architectures.
Is the AD9841AJST pin-compatible with any other devices in the AD984x family?
Yes, the AD9841AJST is pin-compatible with the AD9842AJST - both use identical 48-lead LQFP (ST-48) packaging, shared pin functions, and identical power/ground/bias pin assignments. The only hardware difference is the ADC resolution (10-bit vs. 12-bit), which is reflected in D0–D9 vs. D0–D11 output width and internal register behavior.
AD9841AJST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 48-LQFP
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- CCD Signal Processor, 10-Bit
- Input Type:
- Logic
- Output Type:
- Logic
- Current - Supply:
- -
- Operating Temperature:
- -20°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
AD9841AJST FAQ
1.How can I place an order for AD9841AJST through Aetrix?
Please submit a Request for Quotation (RFQ) for AD9841AJST on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD9841AJST reliable?
The price and inventory of AD9841AJST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD9841AJST is usually 5 days.
3.What payment methods are accepted for AD9841AJST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD9841AJST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD9841AJST?
AD9841AJST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD9841AJST order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD9841AJST?
For technical support, including AD9841AJST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD9841AJST requirements.
6.How does Aetrix verify that AD9841AJST is sourced from the original manufacturer or authorized distributors?
All AD9841AJST products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD9841AJST meets industry standards.
7.What is the process for return or replacement of AD9841AJST?
All AD9841AJST units undergo pre-shipment inspection (PSI). If there is an issue with AD9841AJST, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD9841AJST part is unused and in its original packaging.
Return procedure for AD9841AJST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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