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Analog Devices Inc. AD679SJ/883B
- Part No.:
- AD679SJ/883B
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
AD679SJ/883B.pdf
- Description:
- IC ADC 14BIT 128KSPS 44JLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,047
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Product details
Overview
AD679SJ/883B from Analog Devices is a 14-bit, 128 kSPS monolithic sampling ADC with integrated sample-and-hold amplifier, on-chip 5 V reference, clock generator, and 8-bit bus interface. It delivers 78 dB S/N+D (K/B/T grades), 1 MHz full-power bandwidth, and 10 MΩ input impedance, enabling direct connection to unbuffered sources in precision data acquisition systems for military-grade instrumentation.
For engineers reviewing the AD679SJ/883B datasheet, AD679SJ/883B pinout, AD679SJ/883B application, or AD679SJ/883B equivalent, key selection considerations include MIL-STD-883B compliance, bipolar/unipolar mode support via BIPOFF pin, two-read 14-bit output timing, ±12 V / +5 V supply operation, and compatibility with AD678-based legacy designs requiring upgrade to 14-bit resolution.
Technical Context
The AD679SJ/883B implements a recursive subranging architecture with flash converter circuitry and error correction to achieve 14-bit accuracy at 128 kSPS. Its sample-and-hold amplifier supports 1.5 µs input settling time and 150 ps aperture jitter, enabling undersampling of signals beyond Nyquist while maintaining linearity.
It operates in synchronous or asynchronous mode via SYNC pin configuration, with EOC signaling conversion status and HBE-controlled high/low byte read sequencing. The device uses BiMOS process technology-combining CMOS logic and bipolar analog circuits-with laser-trimmed thin-film resistors for stable dc performance across –55°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - provides 16,384 discrete levels for high-precision measurement of analog signals up to 10 V full-scale. |
| Sampling Rate | 128 kSPS - enables real-time capture of signals with bandwidth up to 500 kHz linear range without aliasing degradation. |
| S/N+D Ratio | 78 dB (typ) at –0.5 dB input - ensures >12.6 effective bits for dynamic signal fidelity in radar and communications receivers. |
| Input Range | ±5 V bipolar or 0–10 V unipolar - selectable via BIPOFF pin connection, supporting both signed and unsigned sensor or control loop outputs. |
| Full-Power Bandwidth | 1 MHz - allows accurate digitization of fast transients and pulse waveforms without slew-induced distortion. |
| Supply Voltages | +12 V (VCC), –12 V (VEE), +5 V (VDD) - dual analog rails enable true bipolar input handling; digital rail powers TTL/CMOS-compatible interface. |
| Power Dissipation | 560 mW (typ) - manageable thermal load in sealed military enclosures with passive heatsinking. |
Pinout & Package
AD679SJ/883B is supplied in a 28-lead ceramic DIP package (D-28), screened per MIL-STD-883B, with pins arranged for analog/digital ground separation and low-noise layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (Pin 6) | Analog Input | High-impedance (10 MΩ) node accepting ±5 V or 0–10 V signals directly-no external buffer required for low-source-impedance sensors. |
| BIPOFF (Pin 10) | Mode Select | Connect to AGND for unipolar mode (straight binary); connect to REFOUT for bipolar mode (twos complement)-configures coding and input range. |
| REFOUT (Pin 8) | Reference Output | 5 V ±20 mV precision reference source; supplies internal DAC and external calibration circuitry; requires 10 µF tantalum decoupling. |
| SC (Pin 3) | Start Convert | Active-low edge-triggered command initiating conversion; must be pulsed ≤3 µs wide to avoid accuracy degradation. |
| EOC (Pin 27) | End-of-Convert | Open-drain (asynchronous) or 3-state (synchronous) status flag-goes HIGH when conversion completes and data is ready to read. |
| HBE (Pin 15) | High Byte Enable | Controls DB7–DB0 output content: LOW = high byte (bits 13–6); HIGH = low byte (bits 5–0) - enables 8-bit bus access to full 14-bit result. |
| AGND (Pin 7) | Analog Ground | Dedicated return path for AIN only-must be isolated from DGND to prevent digital noise coupling into analog signal path. |
Key Features
| Feature | Design Value |
|---|---|
| Complete integration | On-chip SHA, reference, clock, and 8-bit interface eliminate ≥12 external components-reduces board area and calibration complexity in SWaP-constrained systems. |
| MIL-STD-883B compliance | Screened for mechanical shock, temperature cycling, and hermeticity-qualified for flight-critical avionics and ground-based radar subsystems. |
| Factory laser trimming | Eliminates need for user calibration; guarantees INL ≤2.5 LSB and gain error ≤0.11% FSR over –55°C to +125°C without external trims. |
| Two-read 14-bit interface | Left-justified output (8 + 6 bits) compatible with standard 8-bit microprocessor buses-avoids costly 16-bit data paths in legacy embedded controllers. |
| Pin compatibility with AD678 | Direct drop-in replacement for 12-bit AD678 in existing layouts-enables resolution upgrade without PCB redesign or firmware changes. |
Applications
| Radar Signal Digitization | Flight Control Sensor Interface |
|---|---|
Use Scenario: Digitizing intermediate frequency (IF) outputs from radar receiver chains operating at 1–500 kHz baseband. IC Role / Device Role / Timing Role: High-linearity sampling ADC capturing amplitude and phase information with minimal harmonic distortion for Doppler processing. Use Value: 78 dB S/N+D and 500 kHz full-linear bandwidth preserve target resolution and clutter rejection capability in pulse-Doppler radar systems. |
Use Scenario: Converting analog outputs from inertial measurement units (IMUs), accelerometers, and gyros in aircraft flight control computers. IC Role / Device Role / Timing Role: Precision dc-coupled ADC acquiring static and dynamic sensor voltages under extreme temperature and vibration conditions. Use Value: MIL-STD-883B screening and <±0.1% FSR gain drift ensure consistent closed-loop stability across –55°C to +125°C operational envelope. |
| Electronic Warfare Receivers | Strategic Test Equipment |
Use Scenario: Capturing wideband RF front-end outputs in SIGINT platforms requiring high dynamic range and spurious-free performance. IC Role / Device Role / Timing Role: High-speed sampling ADC providing clean digitized IF samples for real-time FFT and demodulation algorithms. Use Value: –90 dB peak spurious component and –90 dB IMD suppress false targets and improve signal detection sensitivity in dense RF environments. |
Use Scenario: Calibrating and validating high-accuracy voltage standards, thermocouple simulators, and metrology-grade power supplies. IC Role / Device Role / Timing Role: Reference-grade ADC serving as traceable measurement engine in automated test systems requiring NIST-traceable uncertainty. Use Value: Factory-trimmed INL ≤2.5 LSB and 14-bit monotonicity guarantee measurement repeatability within ±0.006% FSR across production lots. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD679TD | MIL-STD-883B not specified; commercial-grade screening; same D-28 package and pinout. | Qualified for industrial, not aerospace/military use; lacks radiation hardness and extended reliability testing. | Select AD679TD only for non-safety-critical ground test equipment where cost is prioritized over qualification rigor. |
| AD7792BRUZ | 24-bit Σ-Δ architecture; 4.17–470 SPS max rate; integrated PGA and reference; no internal SHA. | Optimized for low-noise dc measurements (e.g., strain gauges), not high-speed ac signal capture. | Choose AD7792BRUZ for precision weigh scales or medical sensors-not for radar or EW where 128 kSPS and 1 MHz bandwidth are mandatory. |
Compared with AD679TD and AD7792BRUZ, the AD679SJ/883B uniquely combines MIL-qualified reliability, 14-bit SAR speed, and integrated SHA/reference-making it irreplaceable in airborne radar digitizers where all three attributes are simultaneously required.
Availability
AD679SJ/883B is available at Aetrix Electronics and suitable for radar signal digitization, flight control sensor interfacing, electronic warfare receivers, and strategic test equipment requiring stable component supply across long production lifecycles and defense procurement cycles.
Supply support for AD679SJ/883B 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The AD679 product line was designed for high-reliability, high-accuracy data acquisition in defense, aerospace, and industrial instrumentation-emphasizing integrated functionality, MIL-qualified packaging, and guaranteed dc/ac performance over extreme temperature ranges.
FAQ
What is the operating temperature range of the AD679SJ/883B?
The AD679SJ/883B is rated for operation from –55°C to +125°C, meeting MIL-STD-883B Class S requirements. This extended range is validated through temperature cycling, burn-in, and parametric testing per Method 5005, ensuring reliable performance in jet engine bays, missile guidance sections, and space-qualified payloads where ambient extremes exceed commercial grade limits.
Does the AD679SJ/883B require external calibration components?
The AD679SJ/883B is factory laser-trimmed for offset, gain, and linearity-no external calibration is needed to meet datasheet specifications. Optional 50 Ω trim pots may be added for fine-tuning in unipolar or bipolar modes, but the AD679SJ/883B achieves ≤2.5 LSB INL and ≤0.11% FSR gain error out-of-box across its full temperature range.
How is the 14-bit result read from the AD679SJ/883B?
The AD679SJ/883B outputs its 14-bit result in two 8-bit reads: first the high byte (bits 13–6) when HBE is LOW, then the low byte (bits 5–0) when HBE is HIGH. Data is left-justified in the 16-bit word, with straight binary coding in unipolar mode and twos complement in bipolar mode-enabling seamless interface to 8-bit microcontrollers without data alignment overhead.
Is the AD679SJ/883B pin-compatible with the AD678?
Yes-the AD679SJ/883B maintains identical pinout, package footprint, and electrical interface with the AD678 12-bit ADC. This allows direct replacement in legacy designs to upgrade resolution from 12 to 14 bits without PCB modification, provided system firmware accommodates the longer conversion time (6.3 µs vs. AD678's ~5 µs) and two-read data protocol.
What power supply configuration does the AD679SJ/883B require?
The AD679SJ/883B requires three independent supplies: +12 V (VCC), –12 V (VEE), and +5 V (VDD). VCC and VEE power the analog section-including the SHA and reference-while VDD powers the digital interface. Decoupling is critical: 10 µF tantalum on REFIN and 0.1 µF ceramics on each supply pin near the package are mandatory to maintain 78 dB S/N+D performance.
AD679SJ/883B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
AD679SJ/883B FAQ
1.How can I place an order for AD679SJ/883B through Aetrix?
Please submit a Request for Quotation (RFQ) for AD679SJ/883B 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 AD679SJ/883B reliable?
The price and inventory of AD679SJ/883B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD679SJ/883B is usually 5 days.
3.What payment methods are accepted for AD679SJ/883B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD679SJ/883B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD679SJ/883B?
AD679SJ/883B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD679SJ/883B 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 AD679SJ/883B?
For technical support, including AD679SJ/883B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD679SJ/883B requirements.
6.How does Aetrix verify that AD679SJ/883B is sourced from the original manufacturer or authorized distributors?
All AD679SJ/883B 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 AD679SJ/883B meets industry standards.
7.What is the process for return or replacement of AD679SJ/883B?
All AD679SJ/883B units undergo pre-shipment inspection (PSI). If there is an issue with AD679SJ/883B, 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 AD679SJ/883B part is unused and in its original packaging.
Return procedure for AD679SJ/883B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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