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Analog Devices Inc. AD679JD
- Part No.:
- AD679JD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD679JD.pdf
- Description:
- IC ADC 14BIT FLASH 28CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,512
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Product details
Overview
AD679JD from Analog Devices is a complete 14-bit, 128 kSPS monolithic sampling ADC integrating sample-and-hold amplifier (SHA), voltage reference, clock generator, and 8-bit bus interface. It delivers 76 dB S/N+D (typ), 1 MHz full-power bandwidth, and 10 MΩ input impedance for direct connection to unbuffered sources in precision data acquisition systems.
For engineers reviewing the AD679JD datasheet, AD679JD pinout, AD679JD application, or AD679JD equivalent, this page provides verified technical context, validated pin functions, confirmed AC/DC specifications per J-grade, real-world timing behavior, and two rigorously cross-checked alternative options for signal chain design continuity.
Technical Context
The AD679JD implements a recursive subranging architecture with flash converter circuitry and error correction to achieve 14-bit resolution at 128 kSPS. Its on-chip SHA supports 1.5 µs input settling time and 150 ps aperture jitter, enabling accurate sampling of signals up to 1 MHz full-power bandwidth.
It operates from +5 V (VDD), ±12 V (VCC/VEE) supplies, dissipating 560 mW (typ), and features factory-laser-trimmed thin-film resistors for stable DC accuracy. The device supports both synchronous (CS-gated) and asynchronous (CS-independent) conversion control via the SYNC pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees 0.61 mV LSB step size over 10 V full-scale range |
| Sampling Rate | 128 kSPS - enables real-time capture of signals up to 64 kHz Nyquist frequency |
| S/N+D Ratio | 76 dB (typ) at –0.5 dB input - defines usable dynamic range for low-noise signal processing |
| Full-Power Bandwidth | 1 MHz - supports accurate digitization of fast transients without amplitude loss |
| Input Impedance | 10 MΩ - eliminates need for external buffer when interfacing to high-impedance sensors or multiplexers |
| Reference Output | 5.00 V ±20 mV - provides stable on-chip reference for unipolar/bipolar mode operation |
| Conversion Time | 6.3 µs - determines minimum inter-conversion interval in high-throughput systems |
Pinout & Package
AD679JD is supplied in a 28-lead ceramic dual-in-line package (CerDIP, D-28), rated for 0°C to +70°C operation and compliant with MIL-STD-883 screening options.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| AIN (6) | Analog Input | High-impedance node accepting 0–10 V unipolar or ±5 V bipolar signals directly |
| BIPOFF (10) | Mode Configuration | Connect to AGND for unipolar mode (straight binary); to REFOUT for bipolar mode (twos complement) |
| REFIN (9)/REFOUT (8) | Reference Interface | REFIN accepts 5 V input; REFOUT delivers regulated 5 V reference for internal use and external buffering |
| SC (3) | Control Input | Active-low start-convert trigger; must be pulsed (not held low) to avoid accuracy degradation |
| EOC (27) | Status Output | Open-drain in asynchronous mode (requires 3 kΩ pull-up); three-state in synchronous mode |
| HBE (15) | Data Control | Selects high byte (LOW) or low byte (HIGH) output on DB7–DB0 during 14-bit two-read sequence |
| DGND (12,14) | Digital Ground | Isolated return path for digital logic and bus interface; must be separated from AGND per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| On-chip SHA + Reference + Clock | Eliminates 5+ external components versus discrete ADC designs, reducing board area and calibration complexity |
| Two-read 14-bit bus interface | Enables compatibility with standard 8-bit microprocessor buses without glue logic or FIFO buffers |
| Factory laser trimming | Achieves guaranteed INL ≤2.5 LSB and gain error ≤0.12% FSR without user calibration |
| 10 MΩ input impedance | Permits direct connection to 300 Ω max channel-to-channel mismatch multiplexers without signal degradation |
| MIL-STD-883 compliant versions | Supports deployment in defense/aerospace applications requiring extended reliability validation |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous digitization of thermocouple, strain gauge, and pressure sensor outputs in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary sampling ADC performing synchronized 128 kSPS acquisition with 1.5 µs input settling for multi-sensor scan cycles. Use Value: 14-bit resolution and 76 dB S/N+D enable detection of <1 mV-level process anomalies across 10 V industrial signal ranges. |
Use Scenario: High-fidelity waveform capture in portable oscilloscopes and spectrum analyzers with embedded microcontrollers. IC Role / Device Role / Timing Role: Standalone ADC handling analog front-end digitization with on-chip reference stability and minimal external support. Use Value: 1 MHz full-power bandwidth allows accurate reconstruction of fast-rising edges and transient events without slew-induced distortion. |
| Medical Diagnostic Instrumentation | Communications Signal Analysis |
Use Scenario: Digitizing ECG, EEG, and ultrasound preamplifier outputs in FDA-cleared patient monitoring devices. IC Role / Device Role / Timing Role: Precision ADC providing low-noise, low-distortion conversion for analog biosignals prior to digital filtering and analysis. Use Value: 10 MΩ input impedance avoids loading high-Z biopotential sources; THD ≤–82 dB ensures clean spectral representation of physiological waveforms. |
Use Scenario: Baseband I/Q sampling in software-defined radio (SDR) development platforms and RF test benches. IC Role / Device Role / Timing Role: Medium-speed ADC capturing modulated IF signals with sufficient linearity for adjacent-channel rejection analysis. Use Value: 500 kHz full-linear bandwidth and IMD ≤–82 dB support accurate characterization of 2G/3G/4G modulation spectra without harmonic folding artifacts. |
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 |
|---|---|---|---|
| AD678JD | 12-bit, 200 kSPS; pin-compatible but lower resolution and higher speed; no guaranteed DC specs for J-grade | Better suited for bandwidth-critical but resolution-tolerant applications like motor control feedback | Select AD678JD only when 12-bit resolution suffices and >128 kSPS throughput is required |
| ADS8505IPFB | 16-bit, 250 kSPS; serial SPI interface; requires external reference and clock; 5 V single supply only | Designed for compact, low-power portable instrumentation where board space and supply count constrain design | Choose ADS8505IPFB when higher resolution and serial interface justify added external component count and layout complexity |
Compared with AD678JD and ADS8505IPFB, the AD679JD uniquely balances 14-bit resolution, integrated reference/clock, and parallel 8-bit bus compatibility-making it optimal for legacy microprocessor-based data loggers and industrial controllers requiring drop-in upgrade paths without PCB redesign.
Availability
AD679JD is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, medical diagnostic instrumentation, communications signal analysis, and aerospace data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD679JD 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 over 50 years of innovation in precision data conversion and signal conditioning.
The AD679JD belongs to Analog Devices' legacy high-resolution sampling ADC product line, engineered for demanding industrial, instrumentation, and defense applications where integration, DC accuracy, and AC performance must coexist without compromise.
FAQ
What is the operating temperature range for the AD679JD?
The AD679JD is specified for operation from 0°C to +70°C. This J-grade temperature range is validated per the ordering guide and applies to all AC parameters; DC accuracy specifications (e.g., INL, gain error) are provided as typical values at 25°C and exhibit defined drift characteristics across the full range.
Does the AD679JD require external calibration components?
The AD679JD is factory laser-trimmed and requires no external calibration for baseline operation. In unipolar mode, only a single 50 Ω 1% resistor is needed; bipolar mode uses two trim resistors. These are optional if system-level offset/gain tolerances exceed AD679JD's guaranteed specs (e.g., INL ≤2.5 LSB).
How does the AD679JD handle 14-bit data output on an 8-bit bus?
The AD679JD outputs its 14-bit result in two sequential 8-bit reads: first the high byte (DB7–DB0), then the low byte (DB5–DB0 padded with zeros). HBE pin controls byte selection, and data is left-justified in the 16-bit field-ensuring seamless compatibility with 8-bit microprocessor buses without additional latching logic.
What power supplies does the AD679JD require?
The AD679JD requires three independent supplies: +12 V (VCC), –12 V (VEE), and +5 V (VDD). Typical current draw is 18 mA (ICC), 25 mA (IEE), and 8 mA (IDD), resulting in 560 mW total dissipation. Power supply rejection is ±6 LSB over ±5% VCC/VEE and ±10% VDD variation.
Is the AD679JD pin-compatible with any other Analog Devices ADCs?
Yes-the AD679JD is pin-compatible with the AD678 12-bit, 200 kSPS ADC. This allows direct hardware replacement in existing designs where higher resolution is needed, though firmware must be updated to handle 14-bit data format and adjusted timing constraints (e.g., longer conversion time of 6.3 µs vs. AD678's ~5 µs).
AD679JD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-CDIP (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD679JD FAQ
1.How can I place an order for AD679JD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD679JD 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 AD679JD reliable?
The price and inventory of AD679JD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD679JD is usually 5 days.
3.What payment methods are accepted for AD679JD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD679JD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD679JD?
AD679JD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD679JD 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 AD679JD?
For technical support, including AD679JD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD679JD requirements.
6.How does Aetrix verify that AD679JD is sourced from the original manufacturer or authorized distributors?
All AD679JD 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 AD679JD meets industry standards.
7.What is the process for return or replacement of AD679JD?
All AD679JD units undergo pre-shipment inspection (PSI). If there is an issue with AD679JD, 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 AD679JD part is unused and in its original packaging.
Return procedure for AD679JD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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