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Analog Devices Inc. AD679AD
- Part No.:
- AD679AD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-CDIP (0.600", 15.24mm)
- Datasheet:
-
AD679AD.pdf
- Description:
- IC ADC 14BIT SAMPLING 28-CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:267
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Product details
Overview
AD679AD from Analog Devices is a complete 14-bit, 128 kSPS monolithic sampling ADC integrating sample-and-hold amplifier (SHA), internal 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 for direct connection to unbuffered sources in precision data acquisition systems.
For engineers reviewing the AD679AD datasheet, AD679AD pinout, AD679AD application, or AD679AD equivalent, this page provides verified technical context, validated pin functions, confirmed DC/AC specifications across –40°C to +85°C operation, and real-world timing and interface constraints for embedded measurement and signal processing designs.
Technical Context
The AD679AD employs a recursive subranging architecture with error correction and flash converter circuitry to achieve 14-bit resolution at 128 kSPS. Its SHA supports 1.5 µs input settling time and 150 ps aperture jitter, enabling accurate undersampling of signals up to 1 MHz.
It operates from +12 V (VCC), –12 V (VEE), and +5 V (VDD) supplies, dissipating 560 mW typical. The device supports both synchronous (CS-gated) and asynchronous (CS-independent) conversion control via SYNC pin configuration, with EOC output behavior differing by mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - guarantees 1 LSB = 0.61 mV over 10 V full-scale range |
| Sampling Rate | 128 kSPS - enables real-time capture of signals up to 500 kHz linear bandwidth without aliasing degradation |
| S/N+D Ratio | 78 dB (min, K/B/T grades) - ensures ≥12.7 effective bits for high-fidelity signal reconstruction |
| Input Range | ±5 V bipolar or 0–10 V unipolar - selectable via BIPOFF pin; supports industrial sensor and instrumentation interfaces |
| Full-Power Bandwidth | 1 MHz - allows accurate digitization of fast transients and wideband analog inputs |
| Supply Voltages | +12 V (VCC), –12 V (VEE), +5 V (VDD) - requires dual analog rails for ±12 V operation and separate digital logic rail |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems with extended thermal cycling |
Pinout & Package
AD679AD is packaged in a 28-lead ceramic DIP (D-28), with pins arranged in dual in-line format and pin 1 identified by notch or dot. All unused pins (16, 17–18) must be tied to DGND or VDD per datasheet guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN (Pin 6) | Analog Input | High-impedance (10 MΩ) node accepting ±5 V or 0–10 V signals; 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) |
| SC (Pin 3) | Digital Input | Active-low start-convert trigger; must be pulsed (not held low) to avoid accuracy degradation |
| EOC (Pin 27) | Digital Output | Open-drain in asynchronous mode (requires 3 kΩ pull-up); three-state in synchronous mode; indicates conversion completion |
| HBE (Pin 15) | Digital Input | Selects high-byte (LOW) or low-byte (HIGH) output on DB7–DB0 for 14-bit left-justified read sequence |
| REFOUT (Pin 8) | Analog Output | 5 V reference source; used internally and externally for bipolar offset setting; load-limited to 0.5 mA in bipolar mode |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 5 V reference | ±0.04% initial accuracy (4.98–5.02 V) with 0.09% FSR drift over temperature - eliminates need for external reference IC in cost-sensitive designs |
| Factory-trimmed INL/DNL | ≤2.5 LSB INL and ≤1 LSB DNL (K/B/T grades) - enables single-supply measurement systems without post-production calibration |
| Two-read 8-bit bus interface | 14-bit result delivered as left-justified 8+6 bit sequence - compatible with legacy 8-bit microcontrollers and avoids 16-bit bus overhead |
| Pin compatibility with AD678 | Same 28-pin DIP footprint as 12-bit AD678 - allows resolution upgrade without PCB redesign in existing hardware |
| MIL-STD-883 screening option | Available as AD679AD/883B variant - supports aerospace and defense applications requiring radiation-hardened qualification |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous voltage/current monitoring of PLC I/O modules with 0–10 V sensor outputs and ±5 V feedback loops. IC Role / Device Role / Timing Role: Primary sampling ADC handling analog front-end digitization at 128 kSPS with 1 MHz bandwidth for transient detection. Use Value: 14-bit resolution and 78 dB S/N+D enable sub-millivolt detection thresholds in noisy factory environments without external amplification. |
Use Scenario: Digitizing waveforms in portable oscilloscopes and spectrum analyzers requiring high dynamic range and low distortion. IC Role / Device Role / Timing Role: Core ADC in signal chain with internal clock and reference - reduces BOM count and layout complexity. Use Value: 500 kHz full-linear bandwidth and 150 ps aperture jitter preserve spectral integrity for FFT-based analysis up to Nyquist frequency. |
| Avionics Sensor Interfaces | Medical Diagnostic Instruments |
Use Scenario: Converting pressure, temperature, and position signals from aircraft subsystems operating across –40°C to +85°C. IC Role / Device Role / Timing Role: Temperature-stable ADC with MIL-qualified variants supporting DO-160 environmental compliance. Use Value: Guaranteed –40°C to +85°C operation with <0.11% FSR gain drift ensures calibrated accuracy across flight envelope without recalibration. |
Use Scenario: Capturing ECG, EEG, and ultrasound analog waveforms where linearity and low noise are critical for diagnostic fidelity. IC Role / Device Role / Timing Role: High-accuracy sampling stage preceding digital filtering and display processing in Class II medical devices. Use Value: 2.5 LSB INL and 78 dB S/N+D meet IEC 62304 requirements for clinical waveform digitization with minimal post-processing correction. |
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 |
|---|---|---|---|
| AD679BD | Same package and pinout; fully specified for DC parameters (INL, gain, offset) - AD679AD specifies AC only | Required where absolute accuracy (e.g., calibration standards, metrology) demands guaranteed DC specs | Select AD679BD when system-level calibration is impractical and factory-trimmed DC performance is mandatory |
| AD7792BRUZ | 24-bit Σ-Δ ADC, 4.17–480 SPS, integrated PGA and reference - fundamentally different architecture and speed class | Suitable for low-speed, high-precision sensor readings (e.g., thermocouples, RTDs), not for 128 kSPS signal acquisition | Choose AD7792BRUZ only for <1 kSPS applications prioritizing resolution over speed; not a functional replacement for AD679AD |
Compared with AD679AD, AD679BD adds guaranteed DC accuracy at identical speed and packaging, while AD7792BRUZ trades sampling rate for ultra-high resolution in low-bandwidth sensing - neither offers pin-compatible or drop-in replacement capability.
Availability
AD679AD is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, avionics sensor interfaces, and medical diagnostic instruments requiring stable component supply across extended temperature ranges.
Supply support for AD679AD 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, headquartered in Norwood, MA, with design centers worldwide.
The AD679 series was developed as a monolithic, self-contained sampling ADC product line targeting precision data acquisition in industrial, instrumentation, and defense systems where integration, reliability, and guaranteed AC/DC specs are critical.
FAQ
What is the operating temperature range for the AD679AD?
The AD679AD is rated for operation from –40°C to +85°C, corresponding to the A/B grade specification. This range is validated for all AC parameters including S/N+D, THD, and full-power bandwidth, making it suitable for industrial environments with wide thermal excursions. DC parameters such as INL and gain error are specified as typicals for this grade, not guaranteed min/max limits.
Does the AD679AD require external reference components?
No, the AD679AD includes an internal 5 V reference (REFOUT) with ±0.04% initial accuracy and 0.09% FSR drift over temperature. In unipolar mode, REFIN is tied to REFOUT; in bipolar mode, REFOUT feeds BIPOFF. Only optional trim resistors (50 Ω 1%) are needed if factory-calibrated accuracy is insufficient - no external reference IC or voltage divider is required for baseline operation.
How is the 14-bit data output structured on the AD679AD?
The AD679AD outputs its 14-bit result in two 8-bit reads: first the high byte (DB7–DB0 containing bits D13–D6), then the low byte (DB7–DB0 containing bits D5–D0, left-justified with D5–D0 in DB5–DB0 and DB7–DB6 = 0). HBE pin controls byte selection: LOW for high byte, HIGH for low byte. Data format is straight binary in unipolar mode and twos complement in bipolar mode.
Can the AD679AD operate in asynchronous conversion mode?
Yes, the AD679AD supports asynchronous mode when SYNC is tied to DGND. In this configuration, SC initiates conversion independently of CS, and EOC becomes an open-drain output requiring a minimum 3 kΩ pull-up resistor. Timing parameters like tBA and tFD do not apply; instead, output timing depends on the RC time constant formed by the pull-up and load capacitance.
Is the AD679AD pin-compatible with other members of the AD67x family?
Yes, the AD679AD shares the same 28-lead ceramic DIP (D-28) pinout as the AD678 12-bit, 200 kSPS ADC and other AD679 variants (e.g., AD679BD, AD679KD). This enables direct hardware upgrades from 12-bit to 14-bit resolution without PCB changes. Pin functions - including AIN, SC, EOC, HBE, and BIPOFF - are identical across all D-28 packaged AD67x devices.
AD679AD 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:
- -
- Input Type:
- -
- Data Interface:
- Parallel
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 2
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD679AD FAQ
1.How can I place an order for AD679AD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD679AD 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 AD679AD reliable?
The price and inventory of AD679AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD679AD is usually 5 days.
3.What payment methods are accepted for AD679AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD679AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD679AD?
AD679AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD679AD 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 AD679AD?
For technical support, including AD679AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD679AD requirements.
6.How does Aetrix verify that AD679AD is sourced from the original manufacturer or authorized distributors?
All AD679AD 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 AD679AD meets industry standards.
7.What is the process for return or replacement of AD679AD?
All AD679AD units undergo pre-shipment inspection (PSI). If there is an issue with AD679AD, 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 AD679AD part is unused and in its original packaging.
Return procedure for AD679AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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