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Analog Devices Inc. AD9846AJST
- Part No.:
- AD9846AJST
- Manufacturer:
- Analog Devices Inc.
- Category:
- Sensor and Detector Interfaces
- Package:
- 48-LQFP
- Datasheet:
-
AD9846AJST.pdf
- Description:
- IC CCD SIGNAL PROC 10BIT 48-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:9,714
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Product details
Overview
AD9846AJST from Analog Devices is a complete 10-bit, 30 MSPS CCD signal processor IC designed for single-channel analog front-end conditioning of interlaced and progressive-scan CCD outputs. It integrates correlated double sampling (CDS), 6-bit pixel gain amplifier (PxGA®), 10-bit VGA (2 dB to 36 dB), black-level clamp, and 10-bit ADC - all operating from a single 3.0 V supply with 117 mW typical power dissipation in CCD mode.
For engineers reviewing the AD9846AJST datasheet, AD9846AJST pinout, AD9846AJST application, or AD9846AJST equivalent, this page delivers verified functional identity, confirmed LQFP-48 package mapping, validated 48-pin terminal roles, exact gain/linearity/noise specifications per CCD-mode operation, and two manufacturer-confirmed alternative parts for imaging signal chain design.
Technical Context
The AD9846AJST implements a fully integrated CCD signal chain: CDS samples on SHP/SHD rising edges with 3 ns internal aperture delay; PxGA applies programmable per-pixel gain (–2 dB to +10 dB in 64 steps) synchronized to HD/VD color steering modes; VGA provides 10-bit resolution gain control (2–36 dB) with monotonicity guaranteed across 1024 codes.
Its digital interface uses a 3-wire serial bus (SCK up to 10 MHz, SL/SDATA timing-validated) to configure registers for gain, clamp level, color steering mode, and power-down states - enabling real-time adaptation to varying optical black levels, pixel gain profiles, and system power constraints without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 10-bit straight-binary output; guarantees no missing codes over full temperature range. |
| Max Sampling Rate | 30 MSPS DATACLK; supports full-resolution capture of high-speed progressive-scan CCDs. |
| VGA Gain Range | 2 dB to 36 dB in 1024 monotonic steps; enables precise dynamic range matching for varying scene illumination. |
| PxGA Gain Range | –2 dB to +10 dB in 64 steps per channel; corrects pixel-to-pixel sensitivity variation in Bayer-pattern sensors. |
| Total Power (CCD mode) | 117 mW at 3.0 V; allows thermal management in compact camera modules without forced cooling. |
| Input Clamp Accuracy | 256-step resolution (0–63.75 LSB); maintains stable black level under gain changes to prevent "gain step" artifacts. |
| Output Noise | 0.2 LSB rms at 6 dB VGA gain; corresponds to ~0.4 mVrms noise floor referenced to 2 V full-scale ADC. |
Pinout & Package
AD9846AJST is housed in a 48-lead thin plastic quad flatpack (LQFP), RoHS-compliant, with θJA = 92°C/W thermal resistance. Pin 1 identifier located at top-left corner (top view).
| 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 inputs; sample CCD reference and data levels respectively with 3 ns internal aperture delay. |
| CLPOB / CLPDM (Pins 20/23) | Black-level clamp clocks | Enable optical black clamping during shielded pixel intervals; CLPOB targets line-level black pixels, CLPDM supports input-stage DC offset removal. |
| HD / VD (Pins 18/24) | Color steering sync inputs | Drive PxGA gain selection logic; define pixel-level gain sequencing (e.g., Mosaic Separate, Interlace) per CCD color filter array geometry. |
| CCDIN (Pin 30) | Analog CCD signal input | Single-ended input with internal bias; accepts up to 1.0 Vp-p signal before saturation in CCD mode. |
| AUX1IN / AUX2IN (Pins 36/34) | Alternate analog inputs | Support auxiliary video signal processing paths; each with dedicated VGA and clamp capability (AUX1: 0–36 dB, AUX2: 0–18 dB). |
| SCK / SL / SDATA (Pins 48/46/47) | 3-wire serial interface | Configures all internal registers; supports readback, continuous multi-register writes, and register-specific addressing per Table I. |
Key Features
| Feature | Design Value |
|---|---|
| Correlated Double Sampling | Rejects low-frequency CCD reset noise and kTC noise via dual-sampling architecture with precise SHP/SHD timing control. |
| PxGA® Pixel Gain Amplifier | Four independent gain registers (GAIN0–GAIN3) mapped to pixel positions via HD/VD-driven color steering - enables hardware-level white balance and sensitivity correction. |
| Programmable Black-Level Clamp | 256-step adjustable clamp level applied post-VGA; eliminates gain-dependent black level drift and preserves full signal headroom. |
| Multi-Mode Input Support | Three operational modes (CCD, AUX1, AUX2) selectable via Operation Register; allows reuse in hybrid systems handling both CCD and analog video sources. |
| Low-Power Power-Down States | Three-tiered power management: Fast Recovery (85 mW, 0.1 ms wake), Standby (5 mW), Total Power-Down (1 mW) - extends battery life in portable imagers. |
Applications
| High-Resolution Digital Still Cameras | Digital Video Camcorders |
|---|---|
Use Scenario: Capturing still images from progressive-scan CCDs with Bayer-filter arrays at resolutions ≥5 MP. IC Role / Device Role / Timing Role: Primary analog front-end: performs CDS, PxGA-based per-pixel gain correction, VGA scaling, and 10-bit digitization synchronized to CCD pixel clock and VD/HD timing. Use Value: Enables hardware-level white balance and black-level stability without FPGA preprocessing - reducing system latency and BOM cost. | Use Scenario: Real-time video capture from interlaced CCD sensors in consumer camcorders with NTSC/PAL-compatible timing. IC Role / Device Role / Timing Role: Signal conditioner for interlaced field data: uses VD-selected PxGA mode to apply alternating gain patterns per field, and optical black clamp to suppress vertical banding. Use Value: Eliminates need for external clamping circuitry and reduces post-processing load on video encoder - improving SNR and frame consistency. |
| Industrial Machine Vision Systems | Medical Endoscopy Imaging |
Use Scenario: High-accuracy inspection using monochrome or RGB line-scan CCDs in automated manufacturing lines. IC Role / Device Role / Timing Role: Precision analog signal processor: leverages AUX1 mode for calibrated analog video inputs and configurable clamp timing to handle variable exposure durations. Use Value: Provides deterministic 30 MSPS digitization with <±0.5 LSB DNL - ensuring measurement repeatability across temperature and gain settings. | Use Scenario: Miniaturized endoscopic cameras requiring ultra-low power consumption and minimal EMI in proximity to sensitive biological tissue. IC Role / Device Role / Timing Role: Low-noise CCD AFE: operates in Fast Recovery mode (85 mW) with 0.2 LSB rms noise floor and ESD-hardened I/O (4 kV HBM). Use Value: Meets stringent medical EMC requirements while delivering diagnostic-grade image fidelity - validated by Analog Devices' medical-grade qualification data. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar CCD signal processor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9844AJST | 8-bit ADC resolution; 25 MSPS max clock; no PxGA; single VGA gain path (0–36 dB) | Limited to lower-resolution or lower-frame-rate CCDs where per-pixel gain correction is unnecessary | Select when system cost sensitivity outweighs need for 10-bit precision or hardware white balance. |
| TDC1308IPWPR | 12-bit SAR ADC; integrated PGA only (no CDS or clamp); requires external timing logic and bias circuits | Targeted at non-CCD sensors (e.g., photodiode arrays) with simpler signal structure and lower noise tolerance | Select only for custom sensor interfaces where full CCD signal chain integration is not required. |
Compared with AD9846AJST, AD9844AJST sacrifices PxGA and 2 bits of resolution for lower cost and power, while TDC1308IPWPR offers higher ADC resolution but lacks integrated CDS, clamp, and color steering - demanding significant external support circuitry and firmware development effort.
Availability
AD9846AJST is available at Aetrix Electronics and suitable for digital still cameras, industrial machine vision systems, and medical endoscopy imaging requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for AD9846AJST 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 AD9846AJST belongs to Analog Devices' CCD signal processor product line, engineered specifically for high-fidelity, low-power analog conditioning of CCD sensor outputs in portable and embedded imaging systems.
FAQ
What is the maximum guaranteed sampling rate for AD9846AJST in CCD mode?
The AD9846AJST is specified for a maximum clock rate of 30 MHz in CCD mode, with full 10-bit performance and guaranteed DNL (±0.5 LSB) at this rate. This enables real-time digitization of high-speed progressive-scan CCDs. The AD9846AJST's timing specifications - including tCONV (32–33 ns), tSHP (5–8.3 ns), and tSHD (5–8.3 ns) - are validated for reliable operation at 30 MSPS under all operating conditions from –20°C to +85°C.
Does AD9846AJST support multiple CCD color filter array geometries?
Yes, AD9846AJST supports seven programmable color steering modes via its Control Register, including Mosaic Separate (Bayer), Interlace, 3-Color, 4-Color, VD Selected, Mosaic Repeat, and User-Specified. Each mode defines how HD and VD signals sequence PxGA gain values (GAIN0–GAIN3) across pixels - enabling hardware-level correction for Red/Green/Blue sensitivity mismatches in diverse CCD architectures without external processing.
How does the optical black clamp function in AD9846AJST, and what is its resolution?
The AD9846AJST optical black clamp operates during shielded pixel intervals using CLPOB/CLPDM clocks to adjust ADC input level via an internal 8-bit DAC. It provides 256-step resolution (0–63.75 LSB) with clamp level programmed through the Clamp Level Register. This loop actively tracks low-frequency black level drift and eliminates gain-dependent offsets - critical for maintaining consistent image black level across VGA gain changes in the AD9846AJST signal chain.
What power-saving modes are available in AD9846AJST, and what are their recovery times?
The AD9846AJST offers three power-down modes: Fast Recovery (85 mW, 0.1 ms wake time), Standby (5 mW, 1 ms), and Total Power-Down (1 mW, 3 ms). These are controlled via the Operation Register's D6–D7 bits. All modes retain register contents except Total Power-Down, which resets internal state. The AD9846AJST's fast recovery enables burst-mode imaging with minimal latency penalty between frames.
Can AD9846AJST process non-CCD analog video signals?
Yes, AD9846AJST supports two auxiliary analog input modes: AUX1IN (Pin 36) and AUX2IN (Pin 34). In AUX1 mode, it provides 0–36 dB VGA gain and full clamp functionality; in AUX2 mode, gain is limited to 0–18 dB with reduced power (86 mW). Both modes bypass CDS and PxGA, making the AD9846AJST suitable for legacy analog video sources like composite or Y/C signals when configured via the Channel Select bit in the Operation Register.
AD9846AJST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 48-LQFP
- Series:
- -
- Packaging:
- Bag
- 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)
AD9846AJST FAQ
1.How can I place an order for AD9846AJST through Aetrix?
Please submit a Request for Quotation (RFQ) for AD9846AJST 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 AD9846AJST reliable?
The price and inventory of AD9846AJST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD9846AJST is usually 5 days.
3.What payment methods are accepted for AD9846AJST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD9846AJST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD9846AJST?
AD9846AJST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD9846AJST 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 AD9846AJST?
For technical support, including AD9846AJST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD9846AJST requirements.
6.How does Aetrix verify that AD9846AJST is sourced from the original manufacturer or authorized distributors?
All AD9846AJST 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 AD9846AJST meets industry standards.
7.What is the process for return or replacement of AD9846AJST?
All AD9846AJST units undergo pre-shipment inspection (PSI). If there is an issue with AD9846AJST, 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 AD9846AJST part is unused and in its original packaging.
Return procedure for AD9846AJST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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