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Analog Devices Inc. AD679AJ
- Part No.:
- AD679AJ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 44-CLCC (J-Lead)
- Datasheet:
-
AD679AJ.pdf
- Description:
- IC ADC 14BIT FLASH 44JLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,628
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Product details
Overview
AD679AJ from Analog Devices is a complete 14-bit monolithic sampling analog-to-digital converter (ADC) integrating sample-and-hold amplifier, internal 5 V reference, clock generation, and 8-bit bus interface. It delivers 128 kSPS throughput, 1 MHz full-power bandwidth, 76 dB S/N+D (typ), 10 MΩ input impedance, and supports both unipolar (0–10 V) and bipolar (±5 V) input ranges. It is used in precision data acquisition systems requiring high dynamic performance without external support components.
For engineers reviewing the AD679AJ datasheet, AD679AJ pinout, AD679AJ application, or AD679AJ equivalent, this page provides verified technical context, validated pin functions for the 44-lead JLCC package, confirmed AC/DC specifications per J-grade testing, real-world application mappings, and two rigorously validated alternative parts with documented functional and grading differences.
Technical Context
The AD679AJ employs a recursive subranging architecture with flash converter circuitry and on-chip error correction to achieve 14-bit resolution at 128 kSPS. Its sample-and-hold amplifier features 1.5 µs input settling time and 150 ps aperture jitter, enabling accurate digitization of signals up to 1 MHz.
It operates from +5 V (VDD), +12 V (VCC), and –12 V (VEE) supplies, dissipating 560 mW typical. The device supports synchronous and asynchronous conversion control via SYNC, SC, and EOCEN pins, with dual-read 14-bit output (8 + 6 bits, left-justified) compatible with 8-bit microprocessor buses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees 1 LSB = 0.61 mV step size over 10 V full-scale range. |
| Sampling Rate | 128 kSPS - enables real-time capture of signals up to 500 kHz linear bandwidth without aliasing. |
| S/N+D Ratio | 76 dB (typ) at –0.5 dB input - ensures ≥12.3 effective bits for high-fidelity signal reconstruction. |
| Input Range | 0–10 V unipolar or ±5 V bipolar - supports direct connection to industrial sensors and instrumentation outputs. |
| Full Power Bandwidth | 1 MHz - allows undersampling of RF or IF signals while preserving amplitude integrity. |
| Input Impedance | 10 MΩ - eliminates need for external buffer amplifiers when interfacing with high-Z sources or multiplexers. |
| Reference | Internal 5 V ±0.4% (4.98–5.02 V) - reduces BOM count and improves system stability vs. external references. |
Pinout & Package
The AD679AJ is housed in a 44-lead ceramic J-leaded chip carrier (JLCC) package with gull-wing leads, rated for –40°C to +85°C operation and compliant with MIL-STD-883 screening options.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (Pin 10) | Analog Input | High-impedance (10 MΩ) node accepting 0–10 V or ±5 V signals directly; no external buffering required. |
| BIPOFF (Pin 15) | Mode Configuration | Connect to AGND for unipolar mode (straight binary); connect to REFOUT for bipolar mode (twos complement). |
| REFIN (Pin 14) | Reference Input | 5 V input sets 10 V full-scale range; requires 10 µF tantalum decoupling to ground for optimal S/N+D. |
| REFOUT (Pin 12) | Reference Output | 5 V ±0.4% source for BIPOFF tie or external circuitry; load-limited to 0.5 mA in bipolar mode. |
| SC (Pin 5) | Conversion Trigger | Active-low start command; must be pulsed (not held low) to avoid accuracy degradation. |
| EOCEN (Pin 1) | EOC Gate Control | Active-low enable for EOC output; in asynchronous mode (SYNC = DGND), EOC is open-drain and requires 3 kΩ pull-up. |
| HBE (Pin 25) | Byte Select | Controls 14-bit read sequence: LOW = high byte (DB7–DB0), HIGH = low byte (DB5–DB0, zero-padded). |
| VCC (Pin 17), VEE (Pin 8), VDD (Pin 43) | Power Supplies | +12 V / –12 V analog rails and +5 V digital rail; power supply rejection ≤6 LSB across all rails. |
Key Features
| Feature | Design Value |
|---|---|
| Complete On-Chip Integration | SHA, ADC core, 5 V reference, clock generator, and 8-bit bus interface co-integrated - eliminates 12+ external components in discrete designs. |
| Factory Laser-Trimmed Accuracy | INL ≤2.5 LSB, gain error ≤0.12% FSR (J-grade, 25°C) - removes need for field calibration or external trim pots in most applications. |
| Microprocessor-Compatible Interface | Two-read 14-bit output with CS, OE, HBE, and EOCEN - enables seamless integration with 8-bit data buses without glue logic. |
| Flexible Conversion Control | Synchronous (CS-gated) or asynchronous (CS-independent) modes via SYNC pin - simplifies timing design in mixed-clock systems. |
| High Input Bandwidth & Low Jitter | 1 MHz full-power bandwidth + 150 ps aperture jitter - supports accurate digitization of fast transients and narrow pulses. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous voltage/current monitoring of PLC I/O modules and sensor arrays in factory automation. IC Role / Device Role / Timing Role: Primary sampling ADC capturing 128 kSPS waveform data from strain gauges, RTDs, and 4–20 mA loop receivers. Use Value: 10 MΩ input impedance enables direct connection to unbuffered 4–20 mA transmitters; 76 dB S/N+D ensures <0.025% measurement uncertainty over 0–10 V range. |
Use Scenario: Digitizing analog outputs from calibrated signal generators and arbitrary waveform sources during bench validation. IC Role / Device Role / Timing Role: High-fidelity acquisition front-end in automated test equipment (ATE) for spectral analysis and distortion measurement. Use Value: 1 MHz full-power bandwidth and 500 kHz linear bandwidth allow accurate capture of harmonics up to 9th order at 100 kHz fundamental; THD ≤–90 dB validates source purity. |
| Medical Instrumentation | Aerospace Data Recorders |
Use Scenario: Acquisition of biopotential signals (ECG, EEG) and transducer outputs (pressure, flow) in portable diagnostic devices. IC Role / Device Role / Timing Role: Precision ADC in battery-powered patient monitors requiring low power, high SNR, and minimal external components. Use Value: Internal 5 V reference and on-chip clock eliminate external ICs, reducing board area by >30%; 560 mW typical power enables thermal management in sealed enclosures. |
Use Scenario: Recording flight-critical analog telemetry (vibration, temperature, fuel pressure) in avionics black boxes operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Radiation-tolerant, MIL-qualified sampling ADC in redundant data acquisition subsystems with deterministic timing. Use Value: J-grade specification with MIL-STD-883 screening option (AD679AJ/883B) ensures reliability under shock, vibration, and extended temperature cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, high-resolution ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD678JN | 12-bit, 200 kSPS, 28-pin plastic DIP; same pinout but lower resolution and no internal reference trimming. | Used where speed > resolution (e.g., motor control feedback), not suitable for 14-bit metrology-grade measurements. | Select AD678JN only if 12-bit accuracy suffices and PCB layout rework is unacceptable. |
| AD7792BRUZ | 24-bit Σ-Δ ADC, 4.17–480 SPS, SPI interface, integrated PGA and reference; no pin compatibility. | Targeted at low-frequency, ultra-high-precision DC measurements (weigh scales, thermocouples), not dynamic signal capture. | Choose AD7792BRUZ for <10 Hz signals requiring 20+ ENOB; AD679AJ remains optimal for >10 kHz wideband acquisition. |
Compared with AD678JN, AD679AJ trades 72 kSPS speed for +2 bits resolution and integrated reference stability; versus AD7792BRUZ, it delivers >30,000× higher sample rate but sacrifices DC precision-making AD679AJ uniquely suited for 10 kHz–500 kHz transient capture in embedded instrumentation.
Availability
AD679AJ is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, medical instrumentation, aerospace data recorders, and precision data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD679AJ 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, with design centers worldwide and ISO 9001-certified manufacturing.
The AD679AJ belongs to Analog Devices' legacy high-speed precision ADC product line, engineered for demanding data acquisition applications where integration, dynamic performance, and temperature-stable accuracy are critical-especially in military, aerospace, and industrial instrumentation.
FAQ
What is the operating temperature range for the AD679AJ?
The AD679AJ is specified for operation from –40°C to +85°C, corresponding to the "A" grade in Analog Devices' ordering nomenclature. This range is validated for all AC parameters (S/N+D, THD, IMD) and typical DC performance (INL, gain, offset). Full DC specifications are guaranteed only for K/B/T grades; J/A/S grades provide tested AC specs with typical DC values.
Does the AD679AJ require external clock circuitry?
No, the AD679AJ includes fully integrated clock generation circuitry and does not require an external clock source. It derives its timing internally to achieve the specified 128 kSPS conversion rate. External clocking is not supported-the device relies exclusively on its on-chip oscillator for timing control.
How is the 14-bit data output structured on the AD679AJ?
The AD679AJ outputs 14-bit data in two sequential 8-bit reads: first the high byte (DB7–DB0, containing bits D13–D6), then the low byte (DB5–DB0, containing bits D5–D0, zero-padded to 8 bits). The HBE pin selects the byte; data is left-justified and formatted as straight binary in unipolar mode or twos complement in bipolar mode.
Can the AD679AJ operate with only a +5 V supply?
No, the AD679AJ requires three separate supplies: +5 V (VDD, digital), +12 V (VCC, analog positive), and –12 V (VEE, analog negative). These are mandatory for proper operation of the internal sample-and-hold amplifier and reference circuitry. Operating with only +5 V will result in functional failure or permanent damage.
Is the AD679AJ pin-compatible with any other Analog Devices ADCs?
Yes, the AD679AJ is pin-compatible with the AD678 12-bit, 200 kSPS ADC family-including AD678JN and AD678JD-despite differing packages (44-lead JLCC vs. 28-lead DIP). Pin mapping is preserved for shared functions (AIN, REFOUT, SC, EOC, etc.), enabling hardware reuse in upgrade paths where resolution is prioritized over speed.
AD679AJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 44-CLCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 128k
- 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:
- Flash
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- ±12V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 44-JLCC (16.39x16.39)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD679AJ FAQ
1.How can I place an order for AD679AJ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD679AJ 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 AD679AJ reliable?
The price and inventory of AD679AJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD679AJ is usually 5 days.
3.What payment methods are accepted for AD679AJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD679AJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD679AJ?
AD679AJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD679AJ 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 AD679AJ?
For technical support, including AD679AJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD679AJ requirements.
6.How does Aetrix verify that AD679AJ is sourced from the original manufacturer or authorized distributors?
All AD679AJ 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 AD679AJ meets industry standards.
7.What is the process for return or replacement of AD679AJ?
All AD679AJ units undergo pre-shipment inspection (PSI). If there is an issue with AD679AJ, 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 AD679AJ part is unused and in its original packaging.
Return procedure for AD679AJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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