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Analog Devices Inc. AD9840JSTRL
- Part No.:
- AD9840JSTRL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Sensor and Detector Interfaces
- Package:
- 48-LQFP
- Datasheet:
-
AD9840JSTRL.pdf
- Description:
- 10-BIT CCD SIGNAL PROCESSOR
- Quantity:
- Payment:
- Shipping:
Inventory:10,000
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Product details
Overview
AD9840JSTRL from Analog Devices is a complete 10-bit, 36 MSPS analog signal processor for CCD imaging systems. It integrates input clamping, correlated double sampling (CDS), digitally controlled VGA (0–18 dB gain), black-level clamping, and an ADC - all in a single 48-lead LQFP package operating from a 3.0 V supply with 140 mW typical power consumption. It targets interlaced/progressive scan CCD arrays in digital still cameras and camcorders.
For engineers reviewing the AD9840JSTRL datasheet, AD9840JSTRL pinout, AD9840JSTRL application, or AD9840JSTRL equivalent, this page delivers verified functional architecture, validated timing parameters, confirmed register-programmable features (gain, clamp level, power-down), and real-world CCD-mode interface constraints including SHP/SHD setup/hold, CLPOB/CLPDM pixel-width limits, and 3-wire serial interface timing at up to 6 MHz SCK.
Technical Context
The AD9840JSTRL implements a single-channel CCD signal chain with dedicated CDS circuitry synchronized to SHP (reference level) and SHD (data level) clocks, enabling noise reduction via correlated sampling. Its VGA provides 512-step gain control across 0–18 dB, with dual-region transfer function (nonlinear below code 511, linear-in-dB above), and guaranteed accuracy over 2–36 dB per specification.
Clamp operation supports three modes-optical black (CLPOB), dummy pixel (CLPDM), and preblanking (PBLK)-with programmable clamp level resolution of 256 steps (0–63.75 LSB). The 3-wire serial interface (SL/SCK/SDATA) enables register writes on SL rising edge and supports continuous multi-register loading with strict bit-length alignment per register map.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution & Rate | 10-bit, 36 MSPS - delivers full-resolution digitization of fast-scan CCD outputs without missing codes. |
| VGA Gain Range | 0 dB to 18 dB (guaranteed 2–36 dB) - enables precise exposure control across varying light conditions in CCD imaging. |
| CDS Clock Support | SHP/SHD timing with ≤7 ns pulsewidth and ≤7 ns edge-to-edge skew - ensures accurate reference/data sampling alignment for low-noise CDS. |
| Clamp Level Resolution | 256 steps (0–63.75 LSB) - allows fine-grained black-level calibration to suppress fixed-pattern noise in CCD output. |
| Serial Interface Speed | 6 MHz max SCK frequency - supports rapid register configuration during system startup or mode switching. |
| Power Supply | 3.0 V single supply - simplifies power design and matches common CCD camera rail requirements. |
| Typical Power Dissipation | 140 mW - enables thermal management in compact digital camera modules without forced cooling. |
Pinout & Package
AD9840JSTRL is housed in a 48-lead thin plastic quad flatpack (LQFP), designated ST-48 per Analog Devices' ordering guide. The package is RoHS-compliant, surface-mountable, and features exposed paddle for thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CCDIN (Pin 30) | Analog Input | Primary differential-capable input for CCD analog video signal; accepts signals referenced to AVSS/AVDD rails. |
| SHP / SHD (Pins 21/22) | Digital Input | CDS sampling clocks - SHP captures reference (reset) level, SHD captures data level; timing-critical for noise cancellation. |
| CLPOB / CLPDM (Pins 20/23) | Digital Input | Black-level clamp clocks - CLPOB uses optical black pixels, CLPDM uses dummy pixels; determines clamp reference point. |
| DO–D9 (Pins 3–12) | Digital Output | 10-bit parallel data bus - outputs latched ADC result on DATACLK rising edge; requires external 3-state control via THREE-STATE pin. |
| SL / SCK / SDATA (Pins 46/48/47) | Digital Input | 3-wire serial interface - SL loads register data on rising edge; SCK clocks SDATA bits; supports readback and write-only modes. |
| RSTB (Pin 43) | Digital Input | Active-low reset - initializes internal registers to default values (e.g., VGA gain = 0x096, clamp enabled, CCD mode); minimum 100 ns pulse width required. |
Key Features
| Feature | Design Value |
|---|---|
| Correlated Double Sampling (CDS) | Hardware-implemented CDS with SHP/SHD clock inputs eliminates reset noise and kTC noise in CCD outputs. |
| Programmable Black-Level Clamp | Three clamp sources (CLPOB, CLPDM, PBLK) with 256-step resolution enable adaptive black-level tracking across temperature and illumination changes. |
| Digitally Controlled VGA | 512-step gain control (0–18 dB) with dual-region transfer function ensures linearity and repeatability in exposure adjustment. |
| Multi-Mode Input Support | Configurable for CCD, AUX1, or AUX2 analog input paths - allows reuse in hybrid systems handling both CCD and standard video signals. |
| Low-Power 3 V Operation | 140 mW typical consumption at 3.0 V enables battery-powered portable imaging applications without thermal throttling. |
Applications
| Digital Still Camera | Digital Camcorder |
|---|---|
Use Scenario: Capturing high-fidelity still images using progressive-scan CCD sensors with automatic exposure control. IC Role / Device Role / Timing Role: Front-end analog signal processor performing CDS, VGA gain scaling, black-level clamping, and 10-bit digitization synchronized to CCD pixel clock. Use Value: Enables >60 dB SNR imaging by removing reset noise and supporting precise gain/offset calibration across varying ambient light. |
Use Scenario: Real-time video capture in consumer-grade camcorders with interlaced CCD sensors and minimal board space. IC Role / Device Role / Timing Role: Single-chip CCD signal conditioner providing timing-aligned SHP/SHD sampling, optical-black clamping, and 36 MSPS digitization. Use Value: Reduces BOM count and layout complexity by integrating CDS, VGA, clamp, and ADC - eliminating discrete op-amp and comparator stages. |
| CCD-Based Industrial Inspection | Medical Endoscopy Imaging |
Use Scenario: High-accuracy machine vision systems inspecting PCBs or semiconductor wafers under controlled lighting. IC Role / Device Role / Timing Role: Precision analog front-end converting CCD output to deterministic 10-bit digital stream with sub-LSB clamp stability. Use Value: Guarantees no missing codes and <1 LSB INL, critical for quantitative pixel intensity analysis in metrology applications. |
Use Scenario: Miniaturized endoscopic cameras requiring low-power, high-SNR image acquisition in confined spaces. IC Role / Device Role / Timing Role: Low-voltage (3 V), low-power (140 mW) analog processor enabling compact, thermally constrained endoscope head designs. Use Value: Supports continuous HD video streaming without thermal shutdown, leveraging efficient CDS and optimized power domains (AVDD/DVDD separation). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CCD analog signal processing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA9981HN/C1 | Integrated HDMI transmitter + 10-bit ADC; lacks CDS and clamp circuits; requires external CDS stage. | Targeted at digital video interfaces, not direct CCD sensor interfacing. | Choose only if system already includes discrete CDS/clamp and requires HDMI output path. |
| AD9844ASTZ | Pin-compatible successor with extended VGA range (0–36 dB), improved SNR (72 dB vs. 70 dB), and enhanced power-down modes. | Same CCD imaging use cases but with higher dynamic range and lower standby current (1 μA vs. 100 μA). | Prefer AD9844ASTZ for new designs requiring wider gain range or lower quiescent power; AD9840JSTRL remains viable for legacy cost-sensitive builds. |
Compared with TDA9981HN/C1, AD9840JSTRL delivers integrated CDS and clamp functionality essential for CCD noise suppression, while AD9844ASTZ offers measurable improvements in gain range and power efficiency without changing PCB layout - making it the recommended upgrade path where performance margins matter.
Availability
AD9840JSTRL is available at Aetrix Electronics and suitable for digital still cameras, digital camcorders, and industrial CCD-based inspection systems requiring stable component supply and long-term obsolescence management.
Supply support for AD9840JSTRL 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, founded in 1965 and headquartered in Wilmington, MA.
The AD9840 belongs to Analog Devices' CCD signal processor product line, designed specifically to replace multi-chip analog front-ends in professional and consumer imaging systems with single-chip integration of CDS, VGA, clamp, and ADC functions.
FAQ
What is the guaranteed VGA gain accuracy range for AD9840JSTRL?
The AD9840JSTRL guarantees VGA gain accuracy over 2 dB to 36 dB, corresponding to gain register codes 87 through 1023. While the full register range supports 0–18 dB, only the 2–36 dB span is tested and specified for linearity and monotonicity per the datasheet's AUX2-mode specifications. This ensures reliable exposure control in production imaging systems.
Does AD9840JSTRL support both interlaced and progressive scan CCD sensors?
Yes, AD9840JSTRL explicitly supports both interlaced and progressive scan area CCD arrays. Its CDS architecture, configurable clamp modes (CLPOB/CLPDM), and flexible timing windows (e.g., CLPOB pulsewidth 2–20 pixels) accommodate varying scan architectures and blanking intervals. The functional block diagram and timing figures confirm compatibility with standard CCD timing protocols.
How is the AD9840JSTRL reset sequence implemented in hardware?
The AD9840JSTRL requires an active-low reset pulse on Pin 43 (RSTB) lasting ≥100 ns after power supplies stabilize. Upon RSTB release, internal registers load defaults: VGA gain = 0x096 (≈12 dB), clamp enabled, CCD mode selected. An RC network (e.g., 10 kΩ + 1.0 μF) is recommended when no system reset signal is available, matching the power-on time constant of the 3.0 V rails.
Can AD9840JSTRL operate with separate analog and digital ground planes?
Yes, AD9840JSTRL mandates separate analog (AVSS) and digital (DVSS, DRVSS) ground connections - Pins 25/26/35 for AVSS, Pins 15/18/24/41 for DVSS, and Pins 1/2 for DRVSS. This partitioning minimizes digital switching noise coupling into the sensitive analog signal path, directly supporting high-SNR CCD signal conditioning as verified in the functional block diagram and pin descriptions.
What is the maximum allowed DATACLK frequency for AD9840JSTRL?
The AD9840JSTRL supports a maximum DATACLK frequency of 36 MHz, corresponding to a minimum clock period of 27.6 ns. This is specified under "CCD-Mode Timing Specifications" with CL = 20 pF load. Exceeding this limit risks violating setup/hold times for DO–D9 outputs (tOD = 14.5 ns, tH = 7.6 ns) and may cause data corruption in the 10-bit parallel output stream.
AD9840JSTRL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 48-LQFP
- Series:
- AD9840
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- CCD Signal Processor, 10-Bit
- Input Type:
- Analog, Digital
- Output Type:
- Serial
- Current - Supply:
- -
- Operating Temperature:
- -20°C ~ 75°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
AD9840JSTRL FAQ
1.How can I place an order for AD9840JSTRL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD9840JSTRL 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 AD9840JSTRL reliable?
The price and inventory of AD9840JSTRL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD9840JSTRL is usually 5 days.
3.What payment methods are accepted for AD9840JSTRL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD9840JSTRL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD9840JSTRL?
AD9840JSTRL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD9840JSTRL 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 AD9840JSTRL?
For technical support, including AD9840JSTRL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD9840JSTRL requirements.
6.How does Aetrix verify that AD9840JSTRL is sourced from the original manufacturer or authorized distributors?
All AD9840JSTRL 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 AD9840JSTRL meets industry standards.
7.What is the process for return or replacement of AD9840JSTRL?
All AD9840JSTRL units undergo pre-shipment inspection (PSI). If there is an issue with AD9840JSTRL, 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 AD9840JSTRL part is unused and in its original packaging.
Return procedure for AD9840JSTRL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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