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Analog Devices Inc. AD9846AJSTZ
- Part No.:
- AD9846AJSTZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Sensor and Detector Interfaces
- Package:
- 48-LQFP
- Datasheet:
-
AD9846AJSTZ.pdf
- Description:
- IC CCD SIGNAL PROC 10BIT 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,792
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Product details
Overview
AD9846AJSTZ from Analog Devices is a complete 10-bit, 30 MSPS CCD signal processor IC for interlaced and progressive-scan area CCD arrays. It integrates correlated double sampling (CDS), 6-bit pixel gain amplifier (PxGA®), 10-bit variable gain amplifier (VGA) with 2 dB–36 dB range, black-level clamp, and 10-bit ADC - all operating from a single 3 V supply and dissipating 117 mW typical in CCD mode. It is used in digital still cameras and industrial imaging systems requiring high-fidelity analog front-end conditioning.
For engineers reviewing the AD9846AJSTZ datasheet, AD9846AJSTZ pinout, AD9846AJSTZ application, or AD9846AJSTZ equivalent, this page provides verified technical context, validated pin functions, confirmed CCD-mode timing constraints, real-world noise and linearity specs (0.2 LSB rms noise, ±0.5 LSB DNL), and two field-validated alternative parts for imaging AFE design continuity.
Technical Context
The AD9846AJSTZ implements a single-channel CCD signal chain with CDS sampling synchronized to SHP/SHD rising edges (3 ns internal aperture delay), followed by PxGA with seven programmable color steering modes (e.g., Mosaic Separate for Bayer filters) and VGA with dual-region gain law (logarithmic below code 512, linear-in-dB above). Its 3-wire serial interface supports register readback and simultaneous update on SL rising edge.
It supports three input modes: CCD mode (CCDIN with optical black clamping via CLPOB/CLPDM), AUX1 mode (AUX1IN with full VGA range), and AUX2 mode (AUX2IN with 0–18 dB VGA). Each mode has distinct power consumption (117 mW / 82 mW / 86 mW), gain resolution (1024 / 1023 / 512 steps), and clamp behavior - with black level adjustment resolved in 256 steps and measured at ADC output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 10-bit straight-binary output; guarantees no missing codes across full temperature range. |
| Max Sample Rate | 30 MSPS DATACLK; defines maximum pixel clock frequency for real-time CCD line capture. |
| VGA Gain Range | 2 dB to 36 dB in 1024 steps; enables precise analog gain matching to CCD output swing and ADC full-scale (2.0 V). |
| PxGA Gain Range | –2 dB to +10 dB in 64 steps per channel; supports per-pixel color gain correction for Bayer/RGB filter arrays. |
| Total Power (CCD mode) | 117 mW at 3.0 V; enables thermal management in compact camera modules without active cooling. |
| Input Clamp Accuracy | Clamp level adjustable from 0 to 63.75 LSB in 256 steps; referenced to ADC output for stable black-level tracking. |
| Output Noise | 0.2 LSB rms at 6 dB VGA gain; corresponds to ~400 µV rms noise floor for 2 V full-scale ADC. |
| Power Supply Rejection | 40 dB PSR; ensures robustness against ripple on AVDD/DVDD rails in noisy embedded power domains. |
Pinout & Package
AD9846AJSTZ is housed in a 48-lead LQFP package (ST-48, 7 mm × 7 mm, 0.5 mm pitch) with exposed pad for thermal dissipation (θJA = 92°C/W). Pin 1 identifier located at top-left corner; pins 1–12 and 48–40 form two parallel rows.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D0–D9 (Pins 3–12) | Digital data outputs | 10-bit parallel straight-binary ADC output; latched on DATACLK rising edge with 9-cycle pipeline latency. |
| SHP / SHD (Pins 21/22) | CDS sampling clocks | Rising-edge-triggered; SHP samples CCD reference level, SHD samples data level - timing critical for noise rejection. |
| CLPOB / CLPDM (Pins 20/23) | Black-level clamp clocks | CLPOB clamps during optical black pixels; CLPDM clamps during dummy/black pixels - both overwrite PBLK. |
| CCDIN (Pin 30) | Analog CCD signal input | DC-coupled input with internal bias; requires external 0.1 µF AC-coupling capacitor for dc restore. |
| AUX1IN / AUX2IN (Pins 36/34) | Alternate analog inputs | Support auxiliary video signals; each routed through dedicated input buffer and shared VGA stage with distinct gain ranges. |
| SCK / SDATA / SL (Pins 48/47/46) | 3-wire serial interface | Up to 10 MHz SCK; SL rising edge updates all loaded registers simultaneously; supports readback and continuous multi-register writes. |
| THREE-STATE (Pin 42) | Digital output enable | Active-high control; disables D0–D9 drivers to prevent bus contention in multi-device systems. |
| STBY (Pin 44) | Standby mode control | Active-high entry into 5 mW standby; fast recovery (<0.1 ms) preserves register state and bias conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CDS + PxGA + VGA + ADC | Single-chip CCD signal chain eliminates discrete component count, layout complexity, and inter-stage mismatch in imaging AFEs. |
| Seven PxGA color steering modes | Hardware-mapped gain selection (e.g., Mosaic Separate, Interlace, 4-Color) synchronizes pixel-level gain to CCD filter geometry without firmware overhead. |
| Optical black clamp loop | Closed-loop correction applied during shielded pixel intervals; tracks low-frequency black-level drift and maintains <±0.5 LSB baseline stability. |
| Three configurable input modes | CCD/AUX1/AUX2 modes allow reuse of same IC across different sensor types or analog video sources with minimal register reconfiguration. |
| Low-noise 10-bit ADC | 0.2 LSB rms noise and ±0.5 LSB DNL ensure accurate digitization of low-contrast image details without histogram distortion. |
| Single 3 V supply operation | Eliminates need for dual-rail supplies; simplifies power design and reduces BOM cost in battery-powered portable imaging devices. |
Applications
| Digital Still Cameras | Digital Video Camcorders |
|---|---|
Use Scenario: Capturing high-resolution still images from progressive-scan CCD sensors in DSLR or mirrorless camera bodies. IC Role / Device Role / Timing Role: Primary analog front-end: performs CDS, PxGA-based white balance, VGA gain scaling, and 10-bit digitization synchronized to SHP/SHD clocks. Use Value: Enables >48 dB SNR and <0.1% peak nonlinearity at 30 MSPS - preserving fine tonal gradation and color fidelity in RAW image pipelines. | Use Scenario: Real-time video capture from interlaced CCD sensors in broadcast-grade camcorders with rolling shutter compensation. IC Role / Device Role / Timing Role: CCD signal conditioner with VD/HD-synchronized PxGA gain switching and line-rate optical black clamping. Use Value: Supports VD-selected color steering mode to match interlaced Bayer patterns, reducing motion-induced color fringing in moving subjects. |
| Industrial Imaging Systems | Machine Vision Inspection |
Use Scenario: High-speed inspection of printed circuit boards using area CCD sensors under controlled lighting. IC Role / Device Role / Timing Role: Precision analog signal processor: removes reset transient (≤500 mV), rejects low-frequency noise via CDS, and digitizes with guaranteed monotonicity. Use Value: Delivers ±0.5 LSB DNL and no missing codes across –20°C to +85°C - ensuring consistent defect detection in factory-floor thermal environments. | Use Scenario: Automated optical inspection (AOI) of semiconductor wafers using high-sensitivity CCDs with large black-level offsets. IC Role / Device Role / Timing Role: Input-stage black-level clamp (via CLPDM) removes up to 200 mV optical black amplitude before VGA amplification. Use Value: Preserves >1.6 V p-p headroom at VGA output even at 36 dB gain - preventing saturation during high-gain defect analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CCD signal processing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9844AJSTZ | 8-bit ADC, 25 MSPS max, no PxGA, single VGA (0–42 dB), 40-pin LQFP | Lacks per-pixel color gain control; suitable only for monochrome or post-processed color systems | Select when color steering and 10-bit precision are unnecessary and lower cost/power (95 mW) is prioritized. |
| TDA8785HN/C1 | 10-bit, 40 MSPS, integrated PLL, no serial interface, 44-pin HTQFP, 5 V supply | Requires external clock synthesis and 5 V rails; lacks PxGA and programmable clamp; fixed timing architecture | Choose for legacy 5 V systems needing higher sample rate but accepting inflexible configuration and no color gain tuning. |
Compared with AD9844AJSTZ, AD9846AJSTZ adds PxGA, 10-bit resolution, and 30 MSPS performance at higher power; versus TDA8785HN/C1, it offers 3 V operation, serial configurability, and adaptive color gain - critical for modern compact, low-power, color-accurate imaging designs.
Availability
AD9846AJSTZ is available at Aetrix Electronics and suitable for digital still cameras, industrial imaging systems, and machine vision inspection requiring stable component supply, long-term lifecycle support, and traceable sourcing for production ramp.
Supply support for AD9846AJSTZ 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 AD9846A belongs to Analog Devices' CCD signal processor product line, designed specifically for high-fidelity, low-noise analog conditioning of interlaced and progressive-scan CCD outputs in professional and industrial imaging applications.
FAQ
What is the maximum guaranteed sample rate for AD9846AJSTZ in CCD mode?
The AD9846AJSTZ is specified for a maximum clock rate of 30 MHz in CCD mode, with DATACLK, SHP, and SHD all operating at 30 MSPS. This is validated across the full operating temperature range (–20°C to +85°C) and ensures full functionality of CDS, PxGA, VGA, and ADC stages without timing violation or performance degradation. The AD9846AJSTZ datasheet confirms tCONV = 32 ns minimum clock period, supporting reliable 30 MSPS operation.
Does AD9846AJSTZ support true 10-bit linearity across its full gain range?
Yes, AD9846AJSTZ guarantees no missing codes and ±0.5 LSB differential nonlinearity (DNL) over its entire 10-bit resolution, independent of VGA or PxGA gain setting. This is confirmed in the "A/D CONVERTER" section of the datasheet, where "No Missing Codes" is specified as "10 Bits Guaranteed" under all operating conditions. The AD9846AJSTZ achieves this via trimmed internal DACs and matched analog paths, enabling accurate histogram generation and quantitative image analysis.
How does the PxGA function in AD9846AJSTZ, and what color filter arrays does it support?
The PxGA in AD9846AJSTZ provides four independently programmable gain values (–2 dB to +10 dB) applied pixel-by-pixel based on vertical (VD) and horizontal (HD) sync timing. It supports seven color steering modes - including Mosaic Separate (Bayer), Interlace, 3-Color, 4-Color, VD Selected, Mosaic Repeat, and User-Specified - each mapped to specific CCD filter geometries. These modes are selected via the Control Register (Address 110), and the AD9846AJSTZ uses HD/VD edges to sequence PxGA Gain0–Gain3 registers without CPU intervention.
Can AD9846AJSTZ operate with a 2.7 V supply, and what is its power consumption at that voltage?
Yes, AD9846AJSTZ operates across AVDD/DVDD/DRVDD = 2.7 V to 3.6 V. At 2.7 V and 30 MSPS in CCD mode, typical power consumption is 85 mW in normal operation, as specified in the "POWER CONSUMPTION" table. This is validated in TPC 1 (Power vs. Sample Rate), which shows 85 mW at 2.7 V and 30 MHz. The AD9846AJSTZ maintains full specification compliance - including DNL, noise, and timing - across this supply range.
What is the purpose of the CLPDM and CLPOB pins on AD9846AJSTZ, and how do they differ?
CLPOB (Pin 20) initiates clamping during optical black (shielded) pixels to remove residual DC offset; CLPDM (Pin 23) initiates clamping during dummy or black pixels in the horizontal blanking interval. Both overwrite PBLK if active simultaneously. CLPOB is recommended for primary black-level correction due to its direct correlation with CCD's built-in black reference pixels, while CLPDM provides flexibility for non-standard timing or extended clamping windows. The AD9846AJSTZ datasheet specifies minimum pulse widths of 2 pixels for CLPOB and 4 pixels for CLPDM.
AD9846AJSTZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 48-LQFP
- Series:
- -
- Packaging:
- Tray
- 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)
AD9846AJSTZ FAQ
1.How can I place an order for AD9846AJSTZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD9846AJSTZ 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 AD9846AJSTZ reliable?
The price and inventory of AD9846AJSTZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD9846AJSTZ is usually 5 days.
3.What payment methods are accepted for AD9846AJSTZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD9846AJSTZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD9846AJSTZ?
AD9846AJSTZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD9846AJSTZ 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 AD9846AJSTZ?
For technical support, including AD9846AJSTZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD9846AJSTZ requirements.
6.How does Aetrix verify that AD9846AJSTZ is sourced from the original manufacturer or authorized distributors?
All AD9846AJSTZ 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 AD9846AJSTZ meets industry standards.
7.What is the process for return or replacement of AD9846AJSTZ?
All AD9846AJSTZ units undergo pre-shipment inspection (PSI). If there is an issue with AD9846AJSTZ, 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 AD9846AJSTZ part is unused and in its original packaging.
Return procedure for AD9846AJSTZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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