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Analog Devices Inc. AD876JR
- Part No.:
- AD876JR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD876JR.pdf
- Description:
- IC ADC 10BIT PIPELINED 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,208
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Product details
Overview
AD876JR from Analog Devices is a CMOS 10-bit, 20 MSPS analog-to-digital converter with on-chip sample-and-hold, single +5 V analog/digital supply operation, 160 mW power dissipation, and guaranteed no missing codes over 0°C to +70°C. It targets high-speed video digitization, CCD imaging systems, and portable data acquisition where resolution, speed, and low power coexist.
For engineers reviewing the AD876JR datasheet, AD876JR pinout, AD876JR application, or AD876JR equivalent, this page delivers verified technical context, exact SOIC-28 package mapping, confirmed 28-pin functional pin assignments, real-world timing and dynamic performance at 3.58 MHz input, and two validated alternative ADCs for design flexibility.
Technical Context
The AD876JR implements a multistage pipelined architecture with output error correction logic to achieve 10-bit accuracy at 20 MSPS while consuming only 160 mW. Its internal sample-and-hold amplifier supports differential nonlinearity of ±0.75 LSB (typ) and integral nonlinearity of ±1.0 LSB (max), with pipeline latency of 3.5 clock cycles.
It features force-sense reference inputs (REFTF/REFTS/REFBF/REFBS) to compensate for voltage drops across internal 250 Ω ladder resistance, enabling precise 2 Vp-p input range control. Digital I/Os support both +5 V and +3.3 V logic via DRVDD-supplied buffers, and three-state outputs allow bus sharing in multi-device systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10 bits - guarantees full-scale quantization with no missing codes over commercial temperature range. |
| Sampling Rate | 20 MSPS - supports real-time digitization of NTSC/PAL video baseband (3.58 MHz) with ≥7.4 ENOB. |
| Power Dissipation | 160 mW at 20 MSPS - enables battery-powered imaging systems without thermal derating. |
| Input Range | 2 Vp-p - set by external reference voltages (e.g., REFTS = +4.0 V, REFBS = +2.0 V). |
| Differential Nonlinearity | ±0.75 LSB (typ) - ensures monotonic transfer function critical for CCD linearity in scanners and camcorders. |
| Effective Number of Bits | 7.8 bits at fIN = 1 MHz - defines usable dynamic range for high-fidelity signal capture. |
| Aperture Jitter | 22 ps - limits SNR degradation in high-frequency sampling applications. |
Pinout & Package
AD876JR is packaged in a 28-lead Small Outline Integrated Circuit (SOIC) with gull-wing leads, RoHS-compliant, rated for 0°C to +70°C operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| D0 (LSB) | Digital Output | Least significant bit of straight-binary output word; high-impedance when THREE-STATE = HIGH. |
| D9 (MSB) | Digital Output | Most significant bit; synchronized to CLK with 10–20 ns output delay. |
| CLK | Digital Input | 20 MSPS clock input buffered from DRVDD; threshold ≈ DRVDD/2; rising-edge triggered pipeline. |
| THREE-STATE | Digital Input | Active-low control: LOW enables D0–D9 outputs; HIGH places all digital outputs in high-impedance state. |
| STBY | Digital Input | Active-high control: HIGH reduces power to <50 mW; retains register state during standby. |
| AIN | Analog Input | Differential-capable single-ended input; 5 pF capacitance; requires drive capable of settling in ≤25 ns. |
| REFTF / REFTS | Analog Input | Force and sense connections for top reference voltage; eliminates IR drop errors in precision biasing. |
| REFBF / REFBS | Analog Input | Force and sense connections for bottom reference voltage; enables accurate 2 Vp-p span setting. |
| AVDD / AVSS | Power | +5 V analog supply and analog ground; must be within 0.5 V of DVDD/DVSS to maintain INL/DNL specs. |
| DRVDD / DRVSS | Power | +3.3 V or +5 V supply for digital I/O buffers; sets VIH/VIL thresholds and output drive strength. |
Key Features
| Feature | Design Value |
|---|---|
| Pipelined multistage architecture | Enables 20 MSPS throughput with only 160 mW power-reducing thermal load in compact imaging modules. |
| Force-sense reference interface | Compensates for internal 5 Ω trace resistance, ensuring stable 2 Vp-p input range despite PCB layout variations. |
| Three-state digital outputs | Allows direct connection to shared data buses without external bus transceivers-simplifying system-level interconnect. |
| Single +5 V supply operation | Eliminates need for dual supplies in portable CCD systems-reducing bill-of-materials and power management complexity. |
| Guaranteed no missing codes | Validated across full temperature range-critical for medical imaging and industrial inspection where code dropout causes artifacts. |
Applications
| Color Document Scanner | Digital Camcorder Front-End |
|---|---|
Use Scenario: Digitizing RGB line-scan outputs from tri-linear CCD sensors at 20 MSPS for real-time color separation. IC Role / Device Role / Timing Role: Primary ADC capturing 10-bit pixel data per channel with sub-ns aperture jitter to preserve edge fidelity. Use Value: 7.8 ENOB at 1 MHz and 7.4 ENOB at 3.58 MHz ensure >60 dB SNR for archival-quality scanning without post-processing correction. |
Use Scenario: Converting composite video signals (NTSC/PAL) in handheld camcorders with battery-constrained thermal budget. IC Role / Device Role / Timing Role: High-speed digitizer interfacing directly to video decoder ICs; operates from single +5 V rail with standby mode for power gating. Use Value: 160 mW consumption and STBY mode (<50 mW) extend recording time while maintaining 46–49 dB SINAD at 3.58 MHz input. |
| Electronic Still Camera Image Pipeline | High-Speed Data Acquisition Module |
Use Scenario: Capturing raw Bayer-pattern output from area CCD sensors in DSLR or mirrorless camera sensor interfaces. IC Role / Device Role / Timing Role: Precision ADC providing 10-bit linear response with no missing codes-enabling accurate demosaic and gamma correction. Use Value: ±0.75 LSB DNL (typ) and guaranteed monotonicity prevent false contours in gradient-rich scenes like skies or skin tones. |
Use Scenario: Sampling transient waveforms in automated test equipment requiring 20 MSPS sustained rate and low-latency pipeline (3.5 cycles). IC Role / Device Role / Timing Role: Core digitizer with deterministic latency and straight-binary output format compatible with FPGA-based capture logic. Use Value: 22 ps aperture jitter and 10–20 ns output delay enable precise time-of-flight measurements with <1 ns timing uncertainty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD9203ARUZ | 10-bit, 40 MSPS, 3 V supply only, LVDS outputs, no force-sense reference | Higher speed but requires level-shifting for +5 V systems; lacks REFTS/REFBS pins for precision reference compensation | Select when migrating to higher sample rates and lower supply voltage; avoid if legacy +5 V interface or reference accuracy is required. |
| MAX1186ECM+ | 10-bit, 20 MSPS, +3.3 V supply, internal reference, no standby mode, TQFP-48 only | Integrated reference simplifies BOM but sacrifices adjustable input range; no STBY pin limits power optimization in portable designs | Choose for cost-sensitive, space-constrained designs where fixed 2 Vp-p range suffices and standby is unnecessary. |
Compared with AD876JR, AD9203ARUZ offers double the sampling rate but demands redesign of power and interface circuitry, while MAX1186ECM+ reduces component count at the expense of reference flexibility and power-state control-making AD876JR optimal for +5 V, precision-adjustable, low-power imaging systems.
Availability
AD876JR is available at Aetrix Electronics and suitable for color document scanners, digital camcorders, electronic still cameras, high-speed data acquisition modules, and CCD-based industrial inspection systems requiring stable component supply across extended production lifecycles.
Supply support for AD876JR 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 is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and signal conversion.
The AD876 product line was designed specifically for high-speed, low-power digitization in imaging and video applications-balancing resolution, throughput, and thermal efficiency in single-supply architectures.
FAQ
What is the maximum clock frequency supported by the AD876JR?
The AD876JR is specified for 20 MSPS operation with full performance compliance. While it may accept slightly higher clock frequencies, Analog Devices does not guarantee specifications beyond 20 MSPS. The AD876JR timing diagram confirms tC = 50 ns minimum, corresponding to 20 MHz; exceeding this risks increased DNL, reduced SINAD, and potential metastability in the pipeline stages.
Does the AD876JR support differential analog input?
The AD876JR accepts single-ended analog input on the AIN pin and does not include dedicated differential input pairs or internal programmable gain instrumentation amplifier. Its input structure is optimized for single-ended driving with 5 pF capacitance and requires external level-shifting (e.g., using AD830 or AD817) for bipolar or ground-referenced signals-per Figure 14 and Figure 15 in the AD876JR datasheet.
What is the purpose of the CML pin on the AD876JR?
The CML pin on the AD876JR is an analog output used to bypass an internal bias point, typically connected to a 0.1 µF capacitor to analog ground. It stabilizes internal common-mode voltage references and must not be left floating or driven externally. This pin appears in the functional block diagram and pin configuration diagrams for both SOIC and TQFP packages, confirming its role in analog core biasing.
Can the AD876JR operate with a 3.3 V analog supply?
No-the AD876JR requires AVDD = +4.5 V to +5.25 V per Absolute Maximum Ratings and DC Accuracy specifications. Its analog core is designed for +5 V operation; applying 3.3 V to AVDD violates the minimum supply requirement and will result in undefined behavior, including failure to meet INL/DNL, missing codes, or complete functional loss. Only DRVDD may be set to 3.3 V for digital I/O compatibility.
How does the AD876JR's standby mode reduce power consumption?
In standby mode (STBY = HIGH), the AD876JR disables its analog front-end, pipeline stages, and output buffers-reducing total power to below 50 mW. This state preserves register settings and allows fast wake-up (<100 ns) upon STBY deactivation. Power savings derive primarily from halting clock distribution to analog sections and disabling current sources in the SHA and correction logic-verified in Figure 8 (Power vs. Sample Rate).
AD876JR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 20M
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Pipelined
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD876JR FAQ
1.How can I place an order for AD876JR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD876JR 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 AD876JR reliable?
The price and inventory of AD876JR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD876JR is usually 5 days.
3.What payment methods are accepted for AD876JR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD876JR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD876JR?
AD876JR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD876JR 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 AD876JR?
For technical support, including AD876JR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD876JR requirements.
6.How does Aetrix verify that AD876JR is sourced from the original manufacturer or authorized distributors?
All AD876JR 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 AD876JR meets industry standards.
7.What is the process for return or replacement of AD876JR?
All AD876JR units undergo pre-shipment inspection (PSI). If there is an issue with AD876JR, 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 AD876JR part is unused and in its original packaging.
Return procedure for AD876JR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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